A64: Synchronize with r16918.

src/a64/code-stubs-a64.h

Index: src/a64/code-stubs-a64.h
diff --git a/src/a64/code-stubs-a64.h b/src/a64/code-stubs-a64.h
index 1f911ccf2cc8750be3b7b3eeb3fd777e4c1aba86..a73eb0e53f7e7354d4c67d393d64380dd59df7ec 100644
--- a/src/a64/code-stubs-a64.h
+++ b/src/a64/code-stubs-a64.h
@@ -154,18 +154,6 @@ class StringAddStub: public PlatformCodeStub {
 };
 
 
-class NumberToStringStub: public PlatformCodeStub {
- public:
-  NumberToStringStub() { }
-
- private:
-  Major MajorKey() { return NumberToString; }
-  int MinorKey() { return 0; }
-
-  void Generate(MacroAssembler* masm);
-};
-
-
 class RecordWriteStub: public PlatformCodeStub {
  public:
   // Stub to record the write of 'value' at 'address' in 'object'.