Implement IC for storing to dictionary case objects....

src/x64/macro-assembler-x64.h

 // Copyright 2009 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 75 matching lines @@
                          Register scratch);
 
   // Check if object is in new space. The condition cc can be equal or
   // not_equal. If it is equal a jump will be done if the object is on new
   // space. The register scratch can be object itself, but it will be clobbered.
   void InNewSpace(Register object,
                   Register scratch,
                   Condition cc,
                   Label* branch);
 
-  // For page containing |object| mark region covering [object+offset] dirty.
-  // object is the object being stored into, value is the object being stored.
-  // If offset is zero, then the scratch register contains the array index into
-  // the elements array represented as a Smi.
-  // All registers are clobbered by the operation.
+  // For page containing |object| mark region covering [object+offset]
+  // dirty. |object| is the object being stored into, |value| is the
+  // object being stored. If |offset| is zero, then the |scratch|
+  // register contains the array index into the elements array
+  // represented as a Smi. All registers are clobbered by the
+  // operation. RecordWrite filters out smis so it does not update the
+  // write barrier if the value is a smi.
   void RecordWrite(Register object,
                    int offset,
                    Register value,
                    Register scratch);
 
+  // For page containing |object| mark region covering [address]
+  // dirty. |object| is the object being stored into, |value| is the
+  // object being stored. All registers are clobbered by the
+  // operation.  RecordWrite filters out smis so it does not update
+  // the write barrier if the value is a smi.
+  void RecordWrite(Register object,
+                   Register address,
+                   Register value);
+
   // For page containing |object| mark region covering [object+offset] dirty.
   // The value is known to not be a smi.
   // object is the object being stored into, value is the object being stored.
   // If offset is zero, then the scratch register contains the array index into
   // the elements array represented as a Smi.
   // All registers are clobbered by the operation.
   void RecordWriteNonSmi(Register object,
                          int offset,
                          Register value,
                          Register scratch);
@@ skipping 780 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_