Move desugaring of super calls with trailing spread to one runtime call.

src/parsing/parser-base.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_PARSING_PARSER_BASE_H
 #define V8_PARSING_PARSER_BASE_H
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
@@ skipping 3134 matching lines @@
         // The calls that need special treatment are the
         // direct eval calls. These calls are all of the form eval(...), with
         // no explicit receiver.
         // These calls are marked as potentially direct eval calls. Whether
         // they are actually direct calls to eval is determined at run time.
         Call::PossiblyEval is_possibly_eval =
             CheckPossibleEvalCall(result, scope());
 
         bool is_super_call = result->IsSuperCallReference();
         if (spread_pos.IsValid()) {
-          args = impl()->PrepareSpreadArguments(args);
           result = impl()->SpreadCall(result, args, pos);
         } else {
           result = factory()->NewCall(result, args, pos, is_possibly_eval);
         }
 
         // Explicit calls to the super constructor using super() perform an
         // implicit binding assignment to the 'this' variable.
         if (is_super_call) {
           result = impl()->RewriteSuperCall(result);
           ExpressionT this_expr = impl()->ThisExpression(pos);
@@ skipping 71 matching lines @@
     } else {
       result = ParseMemberWithNewPrefixesExpression(is_async, CHECK_OK);
     }
     impl()->RewriteNonPattern(CHECK_OK);
     if (peek() == Token::LPAREN) {
       // NewExpression with arguments.
       Scanner::Location spread_pos;
       ExpressionListT args = ParseArguments(&spread_pos, CHECK_OK);
 
       if (spread_pos.IsValid()) {
-        args = impl()->PrepareSpreadArguments(args);
         result = impl()->SpreadCallNew(result, args, new_pos);
       } else {
         result = factory()->NewCallNew(result, args, new_pos);
       }
       // The expression can still continue with . or [ after the arguments.
       result = ParseMemberExpressionContinuation(result, is_async, CHECK_OK);
       return result;
     }
     // NewExpression without arguments.
     return factory()->NewCallNew(result, impl()->NewExpressionList(0), new_pos);
@@ skipping 2239 matching lines @@
     has_seen_constructor_ = true;
     return;
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_BASE_H