Move NumberToStringStub::GenerateLookupNumberStringCache to the MacroAssembler.

src/x64/macro-assembler-x64.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 721 matching lines @@
   // Reconstruct a 64-bit integer from two 32-bit integers masquerading as
   // smis on the top of stack.
   void PopInt64AsTwoSmis(Register dst, Register scratch = kScratchRegister);
 
   void Test(const Operand& dst, Smi* source);
 
 
   // ---------------------------------------------------------------------------
   // String macros.
 
+  // Generate code to do a lookup in the number string cache. If the number in
+  // the register object is found in the cache the generated code falls through
+  // with the result in the result register. The object and the result register
+  // can be the same. If the number is not found in the cache the code jumps to
+  // the label not_found with only the content of register object unchanged.
+  void LookupNumberStringCache(Register object,
+                               Register result,
+                               Register scratch1,
+                               Register scratch2,
+                               Label* not_found);
+
   // If object is a string, its map is loaded into object_map.
   void JumpIfNotString(Register object,
                        Register object_map,
                        Label* not_string,
                        Label::Distance near_jump = Label::kFar);
 
 
   void JumpIfNotBothSequentialAsciiStrings(
       Register first_object,
       Register second_object,
@@ skipping 819 matching lines @@
     masm->popfq();                                                           \
   }                                                                          \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_