[intrinsics] Kill the %_IsMinusZero intrinsic.

src/js/typedarray.js

Index: src/js/typedarray.js
diff --git a/src/js/typedarray.js b/src/js/typedarray.js
index 7becd8947a5a9161b1584d3f1e2bfd93a223d7d3..adb41ec0fb1fbdb12123937b60a45e8018a27d42 100644
--- a/src/js/typedarray.js
+++ b/src/js/typedarray.js
@@ -565,22 +565,20 @@ function TypedArrayReverse() {
 
 
 function TypedArrayComparefn(x, y) {
-  if (IsNaN(x) && IsNaN(y)) {
-    return IsNaN(y) ? 0 : 1;
+  if (x === 0 && x === y) {
+    x = 1 / x;
+    y = 1 / y;
   }
-  if (IsNaN(x)) {
+  if (x < y) {
+    return -1;
+  } else if (x > y) {
+    return 1;
+  } else if (IsNaN(x) && IsNaN(y)) {
+    return IsNaN(y) ? 0 : 1;
+  } else if (IsNaN(x)) {
     return 1;
   }
-  if (x === 0 && x === y) {
-    if (%_IsMinusZero(x)) {
-      if (!%_IsMinusZero(y)) {
-        return -1;
-      }
-    } else if (%_IsMinusZero(y)) {
-      return 1;
-    }
-  }
-  return x - y;
+  return 0;
 }