[parser] Don't rewrite if we're in error state

Bug: chromium:900585
Change-Id: I2f6045ce23af9a15baddc73127b0c4e3e514841c
Reviewed-on: https://chromium-review.googlesource.com/c/1310294
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57186}

src/parsing/pattern-rewriter.cc

@@ -134,6 +134,7 @@ void Parser::DeclareAndInitializeVariables(
     Block* block, const DeclarationDescriptor* declaration_descriptor,
     const DeclarationParsingResult::Declaration* declaration,
     ZonePtrList<const AstRawString>* names) {
+  if (has_error()) return;
   PatternRewriter::DeclareAndInitializeVariables(
       this, block, declaration_descriptor, declaration, names);
 }

test/mjsunit/regress/regress-900585.js

@@ -0,0 +1,5 @@
+// Copyright 2018 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.
+
+assertThrows("/*for..in*/for(var [x5, functional] = this = function(id) { return id } in false) var x2, x;", ReferenceError);