Do not materialize context-allocated values for debug-evaluate.

src/mirror-debugger.js

Index: src/mirror-debugger.js
diff --git a/src/mirror-debugger.js b/src/mirror-debugger.js
index 28b8fc81baa2c067022dfeb67c03303ee3767c29..28ef24de0f2b9c372c9231726bcf295df87aae2a 100644
--- a/src/mirror-debugger.js
+++ b/src/mirror-debugger.js
@@ -1699,30 +1699,12 @@ FrameMirror.prototype.stepInPositions = function() {
 
 FrameMirror.prototype.evaluate = function(source, disable_break,
                                           opt_context_object) {
-  var result_array = %DebugEvaluate(this.break_id_,
-                                    this.details_.frameId(),
-                                    this.details_.inlinedFrameIndex(),
-                                    source,
-                                    Boolean(disable_break),
-                                    opt_context_object);
-  // Silently ignore local variables changes if the frame is optimized.
-  if (!this.isOptimizedFrame()) {
-    var local_scope_on_stack = result_array[1];
-    var local_scope_modifed = result_array[2];
-    for (var n in local_scope_modifed) {
-      var value_on_stack = local_scope_on_stack[n];
-      var value_modifed = local_scope_modifed[n];
-      if (value_on_stack !== value_modifed) {
-        %SetScopeVariableValue(this.break_id_,
-                               this.details_.frameId(),
-                               this.details_.inlinedFrameIndex(),
-                               0,
-                               n,
-                               value_modifed);
-      }
-    }
-  }
-  return MakeMirror(result_array[0]);
+  return MakeMirror(%DebugEvaluate(this.break_id_,
+                                   this.details_.frameId(),
+                                   this.details_.inlinedFrameIndex(),
+                                   source,
+                                   Boolean(disable_break),
+                                   opt_context_object));
 };