Ignore debug stepin in optimized code for array builtins.

src/array.js

Index: src/array.js
diff --git a/src/array.js b/src/array.js
index 104fe3f6418746914ec8cc200263036e800ce4f4..ab8bb39a848ea34a17dc5a47bc04920e3866007a 100644
--- a/src/array.js
+++ b/src/array.js
@@ -1147,28 +1147,16 @@ function ArrayFilter(f, receiver) {
   var result = new $Array();
   var accumulator = new InternalArray();
   var accumulator_length = 0;
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        if (%_CallFunction(receiver, element, i, array, f)) {
-          accumulator[accumulator_length++] = element;
-        }
-      }
-    }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        if (%_CallFunction(receiver, element, i, array, f)) {
-          accumulator[accumulator_length++] = element;
-        }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      if (%_CallFunction(receiver, element, i, array, f)) {
+        accumulator[accumulator_length++] = element;
       }
     }
-    // End of duplicate.
   }
   %MoveArrayContents(accumulator, result);
   return result;
@@ -1192,24 +1180,14 @@ function ArrayForEach(f, receiver) {
     receiver = ToObject(receiver);
   }
 
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        %_CallFunction(receiver, element, i, array, f);
-      }
-    }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        %_CallFunction(receiver, element, i, array, f);
-      }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      %_CallFunction(receiver, element, i, array, f);
     }
-    // End of duplicate.
   }
 }
 
@@ -1233,24 +1211,14 @@ function ArraySome(f, receiver) {
     receiver = ToObject(receiver);
   }
 
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        if (%_CallFunction(receiver, element, i, array, f)) return true;
-      }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      if (%_CallFunction(receiver, element, i, array, f)) return true;
     }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        if (%_CallFunction(receiver, element, i, array, f)) return true;
-      }
-    }
-    // End of duplicate.
   }
   return false;
 }
@@ -1273,24 +1241,14 @@ function ArrayEvery(f, receiver) {
     receiver = ToObject(receiver);
   }
 
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        if (!%_CallFunction(receiver, element, i, array, f)) return false;
-      }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      if (!%_CallFunction(receiver, element, i, array, f)) return false;
     }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        if (!%_CallFunction(receiver, element, i, array, f)) return false;
-      }
-    }
-    // End of duplicate.
   }
   return true;
 }
@@ -1314,24 +1272,14 @@ function ArrayMap(f, receiver) {
 
   var result = new $Array();
   var accumulator = new InternalArray(length);
-  if (%DebugCallbackSupportsStepping(f)) {
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(f);
-        accumulator[i] = %_CallFunction(receiver, element, i, array, f);
-      }
+  var stepping = %_DebugCallbackSupportsStepping(f);
+  for (var i = 0; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(f);
+      accumulator[i] = %_CallFunction(receiver, element, i, array, f);
     }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (var i = 0; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        accumulator[i] = %_CallFunction(receiver, element, i, array, f);
-      }
-    }
-    // End of duplicate.
   }
   %MoveArrayContents(accumulator, result);
   return result;
@@ -1471,27 +1419,14 @@ function ArrayReduce(callback, current) {
   }
 
   var receiver = %GetDefaultReceiver(callback);
-
-  if (%DebugCallbackSupportsStepping(callback)) {
-    for (; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(callback);
-        current =
-          %_CallFunction(receiver, current, element, i, array, callback);
-      }
+  var stepping = %_DebugCallbackSupportsStepping(callback);
+  for (; i < length; i++) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(callback);
+      current = %_CallFunction(receiver, current, element, i, array, callback);
     }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (; i < length; i++) {
-      if (i in array) {
-        var element = array[i];
-        current =
-          %_CallFunction(receiver, current, element, i, array, callback);
-      }
-    }
-    // End of duplicate.
   }
   return current;
 }
@@ -1521,27 +1456,14 @@ function ArrayReduceRight(callback, current) {
   }
 
   var receiver = %GetDefaultReceiver(callback);
-
-  if (%DebugCallbackSupportsStepping(callback)) {
-    for (; i >= 0; i--) {
-      if (i in array) {
-        var element = array[i];
-        // Prepare break slots for debugger step in.
-        %DebugPrepareStepInIfStepping(callback);
-        current =
-          %_CallFunction(receiver, current, element, i, array, callback);
-      }
-    }
-  } else {
-    // This is a duplicate of the previous loop sans debug stepping.
-    for (; i >= 0; i--) {
-      if (i in array) {
-        var element = array[i];
-        current =
-          %_CallFunction(receiver, current, element, i, array, callback);
-      }
+  var stepping = %_DebugCallbackSupportsStepping(callback);
+  for (; i >= 0; i--) {
+    if (i in array) {
+      var element = array[i];
+      // Prepare break slots for debugger step in.
+      if (stepping) %DebugPrepareStepInIfStepping(callback);
+      current = %_CallFunction(receiver, current, element, i, array, callback);
     }
-    // End of duplicate.
   }
   return current;
 }