Move NumberToStringStub::GenerateLookupNumberStringCache to the MacroAssembler.

src/x64/code-stubs-x64.h

Index: src/x64/code-stubs-x64.h
diff --git a/src/x64/code-stubs-x64.h b/src/x64/code-stubs-x64.h
index 41678ecd20e0aac9ee7b7862551de3bf0f86758a..c3eac81671e4514f930579e3905c120f3e6aacc1 100644
--- a/src/x64/code-stubs-x64.h
+++ b/src/x64/code-stubs-x64.h
@@ -212,23 +212,7 @@ class NumberToStringStub: public PlatformCodeStub {
  public:
   NumberToStringStub() { }
 
-  // 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.
-  static void GenerateLookupNumberStringCache(MacroAssembler* masm,
-                                              Register object,
-                                              Register result,
-                                              Register scratch1,
-                                              Register scratch2,
-                                              Label* not_found);
-
  private:
-  static void GenerateConvertHashCodeToIndex(MacroAssembler* masm,
-                                             Register hash,
-                                             Register mask);
-
   Major MajorKey() { return NumberToString; }
   int MinorKey() { return 0; }