[turbofan] Do not optimize with/block-context allocation in global code.

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index 628e7e07b69b1ae2ec4560e6c41058d2abdd58c5..68c3e308dc7df9c26ab9f92d5883389fce4c67d8 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -1189,12 +1189,16 @@ Reduction JSTypedLowering::ReduceJSCreateLiteralObject(Node* node) {
 Reduction JSTypedLowering::ReduceJSCreateWithContext(Node* node) {
   DCHECK_EQ(IrOpcode::kJSCreateWithContext, node->opcode());
   Node* const input = NodeProperties::GetValueInput(node, 0);
+  Node* const closure = NodeProperties::GetValueInput(node, 1);
   Type* input_type = NodeProperties::GetBounds(input).upper;
-  if (FLAG_turbo_allocate && input_type->Is(Type::Receiver())) {
+  // The closure can be NumberConstant(0) if the closure is global code
+  // (rather than a function). We exclude that case here.
+  // TODO(jarin) Find a better way to check that the closure is a function.
+  if (FLAG_turbo_allocate && input_type->Is(Type::Receiver()) &&
+      closure->opcode() != IrOpcode::kNumberConstant) {
     // JSCreateWithContext(o:receiver, f)
     Node* const effect = NodeProperties::GetEffectInput(node);
     Node* const control = NodeProperties::GetControlInput(node);
-    Node* const closure = NodeProperties::GetValueInput(node, 1);
     Node* const context = NodeProperties::GetContextInput(node);
     Node* const load = graph()->NewNode(
         simplified()->LoadField(