[es6] Remaining cases of parameter scopes for sloppy eval

src/parser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // TODO(titzer): remove this include dependency
@@ skipping 528 matching lines @@
 struct ParserFormalParameters : FormalParametersBase {
   struct Parameter {
     Parameter(const AstRawString* name, Expression* pattern,
               Expression* initializer, bool is_rest)
         : name(name), pattern(pattern), initializer(initializer),
           is_rest(is_rest) {}
     const AstRawString* name;
     Expression* pattern;
     Expression* initializer;
     bool is_rest;
+    bool is_simple() const {
+      return pattern->IsVariableProxy() && initializer == nullptr && !is_rest;
+    }
   };
 
   explicit ParserFormalParameters(Scope* scope)
       : FormalParametersBase(scope), params(4, scope->zone()) {}
   ZoneList<Parameter> params;
 
   int Arity() const { return params.length(); }
   const Parameter& at(int i) const { return params[i]; }
 };
 
@@ skipping 802 matching lines @@
         parser_->BuildParameterInitializationBlock(parameters, ok);
     if (!*ok) return;
     if (init_block != nullptr) {
       body->Add(init_block, parser_->zone());
     }
   }
 }
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_