Resolve references to "this" the same way as normal variables

src/scopeinfo.cc

Index: src/scopeinfo.cc
diff --git a/src/scopeinfo.cc b/src/scopeinfo.cc
index 012744992fe783fa072249be7f7454de7699e7ca..4b079b990363fdf63eaccf755c45abf7fae33b5c 100644
--- a/src/scopeinfo.cc
+++ b/src/scopeinfo.cc
@@ -317,7 +317,8 @@ bool ScopeInfo::LocalIsSynthetic(int var) {
   // with user declarations, the current temporaries like .generator_object and
   // .result start with a dot, so we can use that as a flag. It's a hack!
   Handle<String> name(LocalName(var));
-  return name->length() > 0 && name->Get(0) == '.';
+  return (name->length() > 0 && name->Get(0) == '.') ||
+         name->Equals(*GetIsolate()->factory()->this_string());
 }