[es6] Parameter scopes for sloppy eval

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index 2f600b9f0cbc3aa244a94840e6450a96419a549e..4990fab994574a9fb9fbb27814ba93faf3ad5c86 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -284,7 +284,7 @@ class Scope: public ZoneObject {
 
   // Information about which scopes calls eval.
   bool calls_eval() const { return scope_calls_eval_; }
-  bool calls_sloppy_eval() {
+  bool calls_sloppy_eval() const {
     return scope_calls_eval_ && is_sloppy(language_mode_);
   }
   bool outer_scope_calls_sloppy_eval() const {
@@ -305,6 +305,9 @@ class Scope: public ZoneObject {
   // Does this scope access "super" property (super.foo).
   bool uses_super_property() const { return scope_uses_super_property_; }
 
+  // Whether this needs to be represented by a runtime context.
+  bool NeedsContext() const { return num_heap_slots() > 0; }
+
   bool NeedsHomeObject() const {
     return scope_uses_super_property_ ||
            (scope_calls_eval_ && (IsConciseMethod(function_kind()) ||