Use a different map to distinguish eval contexts

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index b6eb1744d4b8d82beea997d6b561a76a54205ebd..11c8c02b517200cac3c7de069663022787b438d9 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -373,6 +373,11 @@ Callable CodeFactory::FastNewFunctionContext(Isolate* isolate) {
   return make_callable(stub);
 }
 
+Callable CodeFactory::FastNewEvalContext(Isolate* isolate) {
+  FastNewEvalContextStub stub(isolate);
+  return make_callable(stub);
+}
+
 // static
 Callable CodeFactory::FastNewClosure(Isolate* isolate) {
   FastNewClosureStub stub(isolate);