Revert of Replace all remaining Oddball checks with new function

src/messages.cc

Index: src/messages.cc
diff --git a/src/messages.cc b/src/messages.cc
index d5a15256b9fa0cfd75b5fda18aaa972dc15d47bf..ee364b9bc6496d786c93eaf747b163476fa6a922 100644
--- a/src/messages.cc
+++ b/src/messages.cc
@@ -249,7 +249,7 @@
 
 
 Handle<Object> CallSite::GetMethodName() {
-  if (!IsJavaScript() || receiver_->IsNull(isolate_) ||
+  if (!IsJavaScript() || receiver_->IsNull() ||
       receiver_->IsUndefined(isolate_)) {
     return isolate_->factory()->null_value();
   }
@@ -341,7 +341,7 @@
 
 bool CallSite::IsToplevel() {
   if (IsWasm()) return false;
-  return receiver_->IsJSGlobalProxy() || receiver_->IsNull(isolate_) ||
+  return receiver_->IsJSGlobalProxy() || receiver_->IsNull() ||
          receiver_->IsUndefined(isolate_);
 }