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 040754529525382aebfb1f942726a745f2946e82..928995abbf6d63601d53ba469a640a4790b5791f 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -37,6 +37,10 @@ enum TaggingMode {
 
 enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET };
 enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK };
+enum PointersToHereCheck {
+  kPointersToHereMaybeInteresting,
+  kPointersToHereAreAlwaysInteresting
+};
 enum LinkRegisterStatus { kLRHasNotBeenSaved, kLRHasBeenSaved };
 
 
@@ -244,7 +248,9 @@ 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,
+      PointersToHereCheck pointers_to_here_check_for_value =
+          kPointersToHereMaybeInteresting);
 
   // As above, but the offset has the tag presubtracted.  For use with
   // MemOperand(reg, off).
@@ -256,7 +262,9 @@ 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,
+      PointersToHereCheck pointers_to_here_check_for_value =
+          kPointersToHereMaybeInteresting) {
     RecordWriteField(context,
                      offset + kHeapObjectTag,
                      value,
@@ -264,9 +272,17 @@ class MacroAssembler: public Assembler {
                      lr_status,
                      save_fp,
                      remembered_set_action,
-                     smi_check);
+                     smi_check,
+                     pointers_to_here_check_for_value);
   }
 
+  void RecordWriteForMap(
+      Register object,
+      Register map,
+      Register dst,
+      LinkRegisterStatus lr_status,
+      SaveFPRegsMode save_fp);
+
   // For a given |object| notify the garbage collector that the slot |address|
   // has been written.  |value| is the object being stored. The value and
   // address registers are clobbered by the operation.
@@ -277,7 +293,9 @@ 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,
+      PointersToHereCheck pointers_to_here_check_for_value =
+          kPointersToHereMaybeInteresting);
 
   // Push a handle.
   void Push(Handle<Object> handle);