Revert "Turn the NumberToStringStub into a hydrogen stub."

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index af37c29cca2e8e88dac1162b1b392fef88fce7d7..0d06209b613db0f9dc46d32dbab532591edd720d 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -339,19 +339,6 @@ Handle<Code> ToNumberStub::GenerateCode(Isolate* isolate) {
 
 
 template <>
-HValue* CodeStubGraphBuilder<NumberToStringStub>::BuildCodeStub() {
-  info()->MarkAsSavesCallerDoubles();
-  HValue* number = GetParameter(NumberToStringStub::kNumber);
-  return BuildNumberToString(number);
-}
-
-
-Handle<Code> NumberToStringStub::GenerateCode(Isolate* isolate) {
-  return DoGenerateCode(isolate, this);
-}
-
-
-template <>
 HValue* CodeStubGraphBuilder<FastCloneShallowArrayStub>::BuildCodeStub() {
   Factory* factory = isolate()->factory();
   HValue* undefined = graph()->GetConstantUndefined();