Tweak the TurboFan pipeline for stub compilation.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index fba3c66dac1a447bd32c31b508b791a3be125ee4..995f05fbd9ac00429cc861acae838d76c29896c8 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -11719,6 +11719,17 @@ void HOptimizedGraphBuilder::GenerateValueOf(CallRuntime* call) {
 }
 
 
+void HOptimizedGraphBuilder::GenerateJSValueGetValue(CallRuntime* call) {
+  DCHECK(call->arguments()->length() == 1);
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* value = Pop();
+  HInstruction* result = Add<HLoadNamedField>(
+      value, nullptr,
+      HObjectAccess::ForObservableJSObjectOffset(JSValue::kValueOffset));
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
 void HOptimizedGraphBuilder::GenerateDateField(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 2);
   DCHECK_NOT_NULL(call->arguments()->at(1)->AsLiteral());
@@ -11880,6 +11891,15 @@ void HOptimizedGraphBuilder::GenerateStringCompare(CallRuntime* call) {
 }
 
 
+void HOptimizedGraphBuilder::GenerateStringGetLength(CallRuntime* call) {
+  DCHECK(call->arguments()->length() == 1);
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* string = Pop();
+  HInstruction* result = AddLoadStringLength(string);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
 // Support for direct calls from JavaScript to native RegExp code.
 void HOptimizedGraphBuilder::GenerateRegExpExec(CallRuntime* call) {
   DCHECK_EQ(4, call->arguments()->length());