Use a different map to distinguish eval contexts

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index ac36cc7913a82db3976569aa182831692be718f0..79bec3dd2fd3d74ed536d86a6dc432e7deb5023c 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -449,7 +449,16 @@ void JSGenericLowering::LowerJSCreateFunctionContext(Node* node) {
   int const slot_count = OpParameter<int>(node->op());
   CallDescriptor::Flags flags = FrameStateFlagForCall(node);
 
-  Callable callable = CodeFactory::FastNewFunctionContext(isolate());
+  Callable callable = CodeFactory::FastNewFunctionContext(isolate(), false);
+  node->InsertInput(zone(), 1, jsgraph()->Int32Constant(slot_count));
+  ReplaceWithStubCall(node, callable, flags);
+}
+
+void JSGenericLowering::LowerJSCreateEvalContext(Node* node) {
+  int const slot_count = OpParameter<int>(node->op());
+  CallDescriptor::Flags flags = FrameStateFlagForCall(node);
+
+  Callable callable = CodeFactory::FastNewFunctionContext(isolate(), true);
   node->InsertInput(zone(), 1, jsgraph()->Int32Constant(slot_count));
   ReplaceWithStubCall(node, callable, flags);
 }