[cleanup] Remove unused SetNativeFlag runtime function

R=jgruber@chromium.org

Bug: v8:8834
Change-Id: I4406208b20481e71aaa83070e02017a6184eac25
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1530811Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60357}

src/runtime/runtime-function.cc

@@ -74,23 +74,6 @@ RUNTIME_FUNCTION(Runtime_FunctionIsAPIFunction) {
 }
 
 
-// Set the native flag on the function.
-// This is used to decide if we should transform null and undefined
-// into the global object when doing call and apply.
-RUNTIME_FUNCTION(Runtime_SetNativeFlag) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-
-  CONVERT_ARG_CHECKED(Object, object, 0);
-
-  if (object->IsJSFunction()) {
-    JSFunction func = JSFunction::cast(object);
-    func->shared()->set_native(true);
-  }
-  return ReadOnlyRoots(isolate).undefined_value();
-}
-
-
 RUNTIME_FUNCTION(Runtime_Call) {
   HandleScope scope(isolate);
   DCHECK_LE(2, args.length());

src/runtime/runtime.h

@@ -174,8 +174,7 @@ namespace internal {
   F(FunctionGetScriptSourcePosition, 1, 1) \
   F(FunctionGetSourceCode, 1, 1)           \
   F(FunctionIsAPIFunction, 1, 1)           \
-  F(IsFunction, 1, 1)                      \
-  F(SetNativeFlag, 1, 1)
+  F(IsFunction, 1, 1)
 
 #define FOR_EACH_INTRINSIC_GENERATOR(F, I)    \
   I(AsyncFunctionAwaitCaught, 2, 1)           \