[stubs] Refactor StringCompareStub and use it for HStringCompareAndBranch.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index f793e6e5d9efb0001967f3a2833d933259ec347c..20da57f0214b834d10f009fd628767089eacd955 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -3064,7 +3064,7 @@ class StringCompareStub : public PlatformCodeStub {
  public:
   explicit StringCompareStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
 
-  DEFINE_CALL_INTERFACE_DESCRIPTOR(ContextOnly);
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(StringCompare);
   DEFINE_PLATFORM_CODE_STUB(StringCompare, PlatformCodeStub);
 };
 
@@ -3077,6 +3077,8 @@ class StringCompareStub : public PlatformCodeStub {
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
-} }  // namespace v8::internal
+
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_