[es6] implement destructuring assignment

src/bailout-reason.h

 // Copyright 2014 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_BAILOUT_REASON_H_
 #define V8_BAILOUT_REASON_H_
 
 namespace v8 {
 namespace internal {
 
 // TODO(svenpanne) introduce an AbortReason and partition this list
 #define ERROR_MESSAGES_LIST(V)                                                 \
   V(kNoReason, "no reason")                                                    \
                                                                                \
   V(k32BitValueInRegisterIsNotZeroExtended,                                    \
     "32 bit value in register is not zero-extended")                           \
   V(kAlignmentMarkerExpected, "Alignment marker expected")                     \
   V(kAllocationIsNotDoubleAligned, "Allocation is not double aligned")         \
   V(kAPICallReturnedInvalidObject, "API call returned invalid object")         \
   V(kArgumentsObjectValueInATestContext,                                       \
     "Arguments object value in a test context")                                \
   V(kArrayBoilerplateCreationFailed, "Array boilerplate creation failed")      \
   V(kArrayIndexConstantValueTooBig, "Array index constant value too big")      \
+  V(kAssignmentPattern, "Destructuring assignment")                            \
   V(kAssignmentToArguments, "Assignment to arguments")                         \
   V(kAssignmentToLetVariableBeforeInitialization,                              \
     "Assignment to let variable before initialization")                        \
   V(kAssignmentToLOOKUPVariable, "Assignment to LOOKUP variable")              \
   V(kAssignmentToParameterFunctionUsesArgumentsObject,                         \
     "Assignment to parameter, function uses arguments object")                 \
   V(kAssignmentToParameterInArgumentsObject,                                   \
     "Assignment to parameter in arguments object")                             \
   V(kBadValueContextForArgumentsObjectValue,                                   \
     "Bad value context for arguments object value")                            \
@@ skipping 236 matching lines @@
 };
 #undef ERROR_MESSAGES_CONSTANTS
 
 
 const char* GetBailoutReason(BailoutReason reason);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BAILOUT_REASON_H_