Add pretenuring support to HAllocateObject.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index bf014da2c7a3742cb848653d5557e31abc271ffb..148635e023ec83c1155dad8cfe43f402a3cb2ade 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -5956,11 +5956,15 @@ void LCodeGen::DoAllocateObject(LAllocateObject* instr) {
          initial_map->unused_property_fields() -
          initial_map->inobject_properties() == 0);
 
-  __ Allocate(instance_size, result, no_reg, scratch, deferred->entry(),
-              TAG_OBJECT);
+  AllocationFlags flags = TAG_OBJECT;
+  if (instr->hydrogen()->CanAllocateInOldPointerSpace()) {
+    flags = static_cast<AllocationFlags>(flags | PRETENURE_OLD_POINTER_SPACE);
+  }
+
+  __ Allocate(instance_size, result, no_reg, scratch, deferred->entry(), flags);
 
   __ bind(deferred->exit());
-  if (FLAG_debug_code) {
+  if (FLAG_debug_code && !instr->hydrogen()->CanAllocateInOldPointerSpace()) {
     Label is_in_new_space;
     __ JumpIfInNewSpace(result, scratch, &is_in_new_space);
     __ Abort("Allocated object is not in new-space");
@@ -5970,6 +5974,7 @@ void LCodeGen::DoAllocateObject(LAllocateObject* instr) {
   // Load the initial map.
   Register map = scratch;
   __ LoadHeapObject(scratch, constructor);
+  // Recording the map slot can be skipped, because maps are not compacted.
   __ mov(map, FieldOperand(scratch, JSFunction::kPrototypeOrInitialMapOffset));
 
   if (FLAG_debug_code) {
@@ -6016,8 +6021,14 @@ void LCodeGen::DoDeferredAllocateObject(LAllocateObject* instr) {
 
   PushSafepointRegistersScope scope(this);
   __ push(Immediate(Smi::FromInt(instance_size)));
-  CallRuntimeFromDeferred(
-      Runtime::kAllocateInNewSpace, 1, instr, instr->context());
+
+  if (instr->hydrogen()->CanAllocateInOldPointerSpace()) {
+    CallRuntimeFromDeferred(
+        Runtime::kAllocateInOldPointerSpace, 1, instr, instr->context());
+  } else {
+    CallRuntimeFromDeferred(
+        Runtime::kAllocateInNewSpace, 1, instr, instr->context());
+  }
   __ StoreToSafepointRegisterSlot(result, eax);
 }