Turn the NumberToStringStub into a hydrogen stub.

src/arm/code-stubs-arm.h

Index: src/arm/code-stubs-arm.h
diff --git a/src/arm/code-stubs-arm.h b/src/arm/code-stubs-arm.h
index a404f0173981ef9795e2aa9ebdba429fda7b96c6..07e6f12be3b4b70ad39601cf36ff6a57d30b61cb 100644
--- a/src/arm/code-stubs-arm.h
+++ b/src/arm/code-stubs-arm.h
@@ -257,18 +257,6 @@ class WriteInt32ToHeapNumberStub : 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:
   RecordWriteStub(Register object,