Allow direct allocation in old pointer space.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 8c893dcdaffe5692101d86bf94e20b2450fb4b2c..395eb212e188bd28ec2c0f819b3a6061a24de2d9 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -550,22 +550,28 @@ class MacroAssembler: public Assembler {
   // ---------------------------------------------------------------------------
   // Allocation support
 
-  // Allocate an object in new space. If the new space is exhausted control
-  // continues at the gc_required label. The allocated object is returned in
-  // result and end of the new object is returned in result_end. The register
-  // scratch can be passed as no_reg in which case an additional object
-  // reference will be added to the reloc info. The returned pointers in result
-  // and result_end have not yet been tagged as heap objects. If
-  // result_contains_top_on_entry is true the content of result is known to be
-  // the allocation top on entry (could be result_end from a previous call to
-  // AllocateInNewSpace). If result_contains_top_on_entry is true scratch
+  // Allocate an object in new space or old pointer space. If the given space
+  // is exhausted control continues at the gc_required label. The allocated
+  // object is returned in result and end of the new object is returned in
+  // result_end. The register scratch can be passed as no_reg in which case
+  // an additional object reference will be added to the reloc info. The
+  // returned pointers in result and result_end have not yet been tagged as
+  // heap objects. If result_contains_top_on_entry is true the content of
+  // result is known to be the allocation top on entry (could be result_end
+  // from a previous call). If result_contains_top_on_entry is true scratch
   // should be no_reg as it is never used.
-  void AllocateInNewSpace(int object_size,
-                          Register result,
-                          Register result_end,
-                          Register scratch,
-                          Label* gc_required,
-                          AllocationFlags flags);
+  enum AllocationTarget {
+    NEW_SPACE,
+    OLD_POINTER_SPACE
+  };
+
+  void Allocate(int object_size,
+                Register result,
+                Register result_end,
+                Register scratch,
+                Label* gc_required,
+                AllocationFlags flags,
+                AllocationTarget target);
 
   void AllocateInNewSpace(int header_size,
                           ScaleFactor element_size,
@@ -892,11 +898,18 @@ class MacroAssembler: public Assembler {
 
   void LeaveExitFrameEpilogue();
 
+  ExternalReference GetTopAddress(AllocationTarget target);
+  ExternalReference GetLimitAddress(AllocationTarget target);
+
   // Allocation support helpers.
   void LoadAllocationTopHelper(Register result,
                                Register scratch,
-                               AllocationFlags flags);
-  void UpdateAllocationTopHelper(Register result_end, Register scratch);
+                               AllocationFlags flags,
+                               AllocationTarget target);
+
+  void UpdateAllocationTopHelper(Register result_end,
+                                 Register scratch,
+                                 AllocationTarget target);
 
   // Helper for PopHandleScope.  Allowed to perform a GC and returns
   // NULL if gc_allowed.  Does not perform a GC if !gc_allowed, and