[destructuring] Support computed property names in patterns.

src/pattern-rewriter.cc

 // Copyright 2015 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.
 
 #include "src/ast.h"
 #include "src/messages.h"
 #include "src/parser.h"
 
 namespace v8 {
 
@@ skipping 206 matching lines @@
 
   block_->AddStatement(
       factory()->NewExpressionStatement(assignment, RelocInfo::kNoPosition),
       zone());
   return temp;
 }
 
 
 void Parser::PatternRewriter::VisitObjectLiteral(ObjectLiteral* pattern) {
   auto temp = CreateTempVar(current_value_);
-  if (pattern->properties()->length() == 0) {
-    block_->AddStatement(descriptor_->parser->BuildAssertIsCoercible(temp),
-                         zone());
-  }
+
+  block_->AddStatement(descriptor_->parser->BuildAssertIsCoercible(temp),
+                       zone());
 
   for (ObjectLiteralProperty* property : *pattern->properties()) {
-    // TODO(dslomov): computed property names.
     RecurseIntoSubpattern(
         property->value(),
         factory()->NewProperty(factory()->NewVariableProxy(temp),
                                property->key(), RelocInfo::kNoPosition));
   }
 }
 
 
 void Parser::PatternRewriter::VisitArrayLiteral(ArrayLiteral* node) {
   // TODO(dslomov): implement.
@@ skipping 69 matching lines @@
 NOT_A_PATTERN(TryFinallyStatement)
 NOT_A_PATTERN(UnaryOperation)
 NOT_A_PATTERN(VariableDeclaration)
 NOT_A_PATTERN(WhileStatement)
 NOT_A_PATTERN(WithStatement)
 NOT_A_PATTERN(Yield)
 
 #undef NOT_A_PATTERN
 }
 }  // namespace v8::internal