Revert "Disable allocation folding when allocations tracking is on"

This reverts r17337. The new test fails on V8 linux - shared: http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20shared/builds/4726/steps/Check/logs/stdio

TBR=mvstanton@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/37073003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17338 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.cc

@@ -3308,10 +3308,7 @@ void HAllocate::HandleSideEffectDominator(GVNFlag side_effect,
                                           HValue* dominator) {
   ASSERT(side_effect == kChangesNewSpacePromotion);
   Zone* zone = block()->zone();
-  if (!FLAG_use_allocation_folding ||
-      isolate()->heap_profiler()->is_tracking_allocations()) {
-    return;
-  }
+  if (!FLAG_use_allocation_folding) return;
 
   // Try to fold allocations together with their dominating allocations.
   if (!dominator->IsAllocate()) {

src/hydrogen-instructions.h

@@ -5300,7 +5300,7 @@ class HAllocate V8_FINAL : public HTemplateInstruction<2> {
                         PretenureFlag pretenure_flag,
                         InstanceType instance_type) {
     return new(zone) HAllocate(context, size, type, pretenure_flag,
-        instance_type, zone);
+        instance_type);
   }
 
   // Maximum instance size for which allocations will be inlined.
@@ -5373,8 +5373,7 @@ class HAllocate V8_FINAL : public HTemplateInstruction<2> {
             HValue* size,
             HType type,
             PretenureFlag pretenure_flag,
-            InstanceType instance_type,
-            Zone* zone)
+            InstanceType instance_type)
       : HTemplateInstruction<2>(type),
         dominating_allocate_(NULL),
         filler_free_space_size_(NULL),
@@ -5397,8 +5396,7 @@ class HAllocate V8_FINAL : public HTemplateInstruction<2> {
     // other, i.e., have a pointer to each other. A GC in between these
     // allocations may leave such objects behind in a not completely initialized
     // state.
-    if (!FLAG_use_gvn || !FLAG_use_allocation_folding ||
-        zone->isolate()->heap_profiler()->is_tracking_allocations()) {
+    if (!FLAG_use_gvn || !FLAG_use_allocation_folding) {
       flags_ = static_cast<HAllocate::Flags>(flags_ | PREFILL_WITH_FILLER);
     }
     clear_next_map_word_ = pretenure_flag == NOT_TENURED &&

test/cctest/test-heap-profiler.cc

@@ -2072,23 +2072,3 @@ TEST(HeapObjectsTracker) {
     "    a.shift();\n"
     "findUntrackedObjects();\n");
 }
-
-
-// If we don't disable allocation folding when allocations tracking is on, we
-// may have untracked allocations.
-TEST(DisableAllocationFolding) {
-  LocalContext env;
-  v8::HandleScope scope(env->GetIsolate());
-  HeapObjectsTracker tracker;
-  CompileRun(
-    "function literal() {"
-    "    return [1];"
-    "}"
-    "function modify_literal(literal, v) {"
-    "    literal[0] = v;"
-    "    return literal;"
-    "}"
-    "obj = modify_literal(literal(), 1);"
-    "obj = modify_literal(literal(), 1.5);"
-    "obj = modify_literal(literal(), 1);");
-}