Improve write barriers in optimized code.

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 5f77be6a4293feb82e6bde281ae0c5769b4c97bf..2299baf6770e53af2324e3b0698167949adb09cd 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -244,7 +244,15 @@ class MacroAssembler: public Assembler {
       LinkRegisterStatus lr_status,
       SaveFPRegsMode save_fp,
       RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
-      SmiCheck smi_check = INLINE_SMI_CHECK);
+      SmiCheck smi_check = INLINE_SMI_CHECK,
+      bool value_is_in_new_space = false);
+
+  void RecordWriteForMap(
+      Register object,
+      Register map,
+      Register dst,
+      LinkRegisterStatus lr_status,
+      SaveFPRegsMode save_fp);
 
   // As above, but the offset has the tag presubtracted.  For use with
   // MemOperand(reg, off).
@@ -256,7 +264,8 @@ class MacroAssembler: public Assembler {
       LinkRegisterStatus lr_status,
       SaveFPRegsMode save_fp,
       RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
-      SmiCheck smi_check = INLINE_SMI_CHECK) {
+      SmiCheck smi_check = INLINE_SMI_CHECK,
+      bool value_is_in_new_space = false) {
     RecordWriteField(context,
                      offset + kHeapObjectTag,
                      value,
@@ -264,7 +273,8 @@ class MacroAssembler: public Assembler {
                      lr_status,
                      save_fp,
                      remembered_set_action,
-                     smi_check);
+                     smi_check,
+                     value_is_in_new_space);
   }
 
   // For a given |object| notify the garbage collector that the slot |address|
@@ -277,7 +287,8 @@ class MacroAssembler: public Assembler {
       LinkRegisterStatus lr_status,
       SaveFPRegsMode save_fp,
       RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET,
-      SmiCheck smi_check = INLINE_SMI_CHECK);
+      SmiCheck smi_check = INLINE_SMI_CHECK,
+      bool value_is_in_new_space = false);
 
   // Push a handle.
   void Push(Handle<Object> handle);