Allow direct allocation in old pointer space.

src/macro-assembler.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 31 matching lines @@
   NO_ALLOCATION_FLAGS = 0,
   // Return the pointer to the allocated already tagged as a heap object.
   TAG_OBJECT = 1 << 0,
   // The content of the result register already contains the allocation top in
   // new space.
   RESULT_CONTAINS_TOP = 1 << 1,
   // Specify that the requested size of the space to allocate is specified in
   // words instead of bytes.
   SIZE_IN_WORDS = 1 << 2,
   // Align the allocation to a multiple of kDoubleSize
-  DOUBLE_ALIGNMENT = 1 << 3
+  DOUBLE_ALIGNMENT = 1 << 3,
+  // Directly allocate in old pointer space
+  PRETENURE_OLD_POINTER_SPACE = 1 << 4
 };
 
 
 // Invalid depth in prototype chain.
 const int kInvalidProtoDepth = -1;
 
 #if V8_TARGET_ARCH_IA32
 #include "assembler.h"
 #include "ia32/assembler-ia32.h"
 #include "ia32/assembler-ia32-inl.h"
@@ skipping 98 matching lines @@
 
 #else
 
 class Comment {
  public:
   Comment(MacroAssembler*, const char*)  {}
 };
 
 #endif  // DEBUG
 
+
+class AllocationUtils {
+ public:
+  static ExternalReference GetAllocationTopReference(
+      Isolate* isolate, AllocationFlags flags) {
+    return ((flags & PRETENURE_OLD_POINTER_SPACE) != 0) ?
+        ExternalReference::old_pointer_space_allocation_top_address(isolate) :
+        ExternalReference::new_space_allocation_top_address(isolate);
+  }
+
+
+  static ExternalReference GetAllocationLimitReference(
+      Isolate* isolate, AllocationFlags flags) {
+    return ((flags & PRETENURE_OLD_POINTER_SPACE) != 0) ?
+        ExternalReference::old_pointer_space_allocation_limit_address(isolate) :
+        ExternalReference::new_space_allocation_limit_address(isolate);
+  }
+};
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_MACRO_ASSEMBLER_H_