Fetch strictmode in the interceptor setter from the IC.

src/stub-cache.cc

Index: src/stub-cache.cc
diff --git a/src/stub-cache.cc b/src/stub-cache.cc
index 480a17b6898706d78af54f8727b3805cdc7efd25..046382cffa0197c90777e97a6687a62f9ec3084b 100644
--- a/src/stub-cache.cc
+++ b/src/stub-cache.cc
@@ -932,16 +932,16 @@ RUNTIME_FUNCTION(MaybeObject*, LoadPropertyWithInterceptorForCall) {
 
 RUNTIME_FUNCTION(MaybeObject*, StoreInterceptorProperty) {
   HandleScope scope(isolate);
-  ASSERT(args.length() == 4);
-  Handle<JSObject> recv(JSObject::cast(args[0]));
-  Handle<Name> name(Name::cast(args[1]));
-  Handle<Object> value(args[2], isolate);
-  ASSERT(args.smi_at(3) == kStrictMode || args.smi_at(3) == kNonStrictMode);
-  StrictModeFlag strict_mode = static_cast<StrictModeFlag>(args.smi_at(3));
-  ASSERT(recv->HasNamedInterceptor());
+  ASSERT(args.length() == 3);
+  StoreIC ic(IC::NO_EXTRA_FRAME, isolate);
+
+  Handle<JSObject> receiver = args.at<JSObject>(0);
+  Handle<Name> name = args.at<Name>(1);
+  Handle<Object> value = args.at<Object>(2);
+  ASSERT(receiver->HasNamedInterceptor());
   PropertyAttributes attr = NONE;
   Handle<Object> result = JSObject::SetPropertyWithInterceptor(
-      recv, name, value, attr, strict_mode);
+      receiver, name, value, attr, ic.strict_mode());
   RETURN_IF_EMPTY_HANDLE(isolate, result);
   return *result;
 }