Make new space iterable for --log-gc and --heap-stats options

R=hpayer@chromium.org
BUG=370827
TEST=test/mjsunit/regress/regress-370827.js
LOG=N

Review URL: https://codereview.chromium.org/272503005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21209 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.cc

@@ -3825,19 +3825,18 @@ bool HAllocate::HandleSideEffectDominator(GVNFlag side_effect,
       dominator_allocate);
   dominator_allocate->UpdateSize(new_dominator_size_constant);
 
+  bool keep_new_space_iterable = FLAG_log_gc || FLAG_heap_stats;
 #ifdef VERIFY_HEAP
-  if (FLAG_verify_heap && dominator_allocate->IsNewSpaceAllocation()) {
+  keep_new_space_iterable = keep_new_space_iterable || FLAG_verify_heap;
+#endif
+
+  if (keep_new_space_iterable && dominator_allocate->IsNewSpaceAllocation()) {
     dominator_allocate->MakePrefillWithFiller();
   } else {
     // TODO(hpayer): This is a short-term hack to make allocation mementos
     // work again in new space.
     dominator_allocate->ClearNextMapWord(original_object_size);
   }
-#else
-  // TODO(hpayer): This is a short-term hack to make allocation mementos
-  // work again in new space.
-  dominator_allocate->ClearNextMapWord(original_object_size);
-#endif
 
   dominator_allocate->UpdateClearNextMapWord(MustClearNextMapWord());
 

test/mjsunit/regress/regress-370827.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --expose-gc --heap-stats
+
+function g(dummy, x) {
+  var start = "";
+  if (x) { start = x + " - "; }
+  start = start + "array length";
+};
+
+function f() {
+  gc();
+  g([0.1]);
+}
+
+f();
+%OptimizeFunctionOnNextCall(f);
+f();
+f();