[es7] implement |do| expressions proposal

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 {
 
@@ skipping 39 matching lines @@
   V(kCouldNotGenerateNegativeZero, "Could not generate -0.0")                  \
   V(kDebuggerStatement, "DebuggerStatement")                                   \
   V(kDeclarationInCatchContext, "Declaration in catch context")                \
   V(kDeclarationInWithContext, "Declaration in with context")                  \
   V(kDefaultNaNModeNotSet, "Default NaN mode not set")                         \
   V(kDeleteWithGlobalVariable, "Delete with global variable")                  \
   V(kDeleteWithNonGlobalVariable, "Delete with non-global variable")           \
   V(kDestinationOfCopyNotAligned, "Destination of copy not aligned")           \
   V(kDontDeleteCellsCannotContainTheHole,                                      \
     "DontDelete cells can't contain the hole")                                 \
+  V(kDoExpression, "Do expression encountered")                                \
   V(kDoPushArgumentNotImplementedForDoubleType,                                \
     "DoPushArgument not implemented for double type")                          \
   V(kEliminatedBoundsCheckFailed, "Eliminated bounds check failed")            \
   V(kEmitLoadRegisterUnsupportedDoubleImmediate,                               \
     "EmitLoadRegister: Unsupported double immediate")                          \
   V(kEval, "eval")                                                             \
   V(kExpectedAlignmentMarker, "Expected alignment marker")                     \
   V(kExpectedAllocationSite, "Expected allocation site")                       \
   V(kExpectedFunctionObject, "Expected function object in register")           \
   V(kExpectedHeapNumber, "Expected HeapNumber")                                \
@@ skipping 196 matching lines @@
 };
 #undef ERROR_MESSAGES_CONSTANTS
 
 
 const char* GetBailoutReason(BailoutReason reason);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BAILOUT_REASON_H_