Revert "Turn the NumberToStringStub into a hydrogen stub."

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 c76abcf001b96d250635c6afabdbaa0ab0266373..c3eac81671e4514f930579e3905c120f3e6aacc1 100644
--- a/src/x64/code-stubs-x64.h
+++ b/src/x64/code-stubs-x64.h
@@ -208,6 +208,18 @@ class StringCompareStub: public PlatformCodeStub {
 };
 
 
+class NumberToStringStub: public PlatformCodeStub {
+ public:
+  NumberToStringStub() { }
+
+ private:
+  Major MajorKey() { return NumberToString; }
+  int MinorKey() { return 0; }
+
+  void Generate(MacroAssembler* masm);
+};
+
+
 class NameDictionaryLookupStub: public PlatformCodeStub {
  public:
   enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP };