Clean up dead code after spread desugaring

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 165 matching lines @@
   V(kReferenceToUninitializedVariable, "Reference to uninitialized variable")  \
   V(kRegisterDidNotMatchExpectedRoot, "Register did not match expected root")  \
   V(kRegisterWasClobbered, "Register was clobbered")                           \
   V(kRememberedSetPointerInNewSpace, "Remembered set pointer is in new space") \
   V(kRestParameter, "Rest parameters")                                         \
   V(kReturnAddressNotFoundInFrame, "Return address not found in frame")        \
   V(kSloppyFunctionExpectsJSReceiverReceiver,                                  \
     "Sloppy function expects JSReceiver as receiver.")                         \
   V(kSmiAdditionOverflow, "Smi addition overflow")                             \
   V(kSmiSubtractionOverflow, "Smi subtraction overflow")                       \
-  V(kSpread, "Spread in array literal")                                        \
   V(kStackAccessBelowStackPointer, "Stack access below stack pointer")         \
   V(kStackFrameTypesMustMatch, "Stack frame types must match")                 \
   V(kSuperReference, "Super reference")                                        \
   V(kTheCurrentStackPointerIsBelowCsp,                                         \
     "The current stack pointer is below csp")                                  \
   V(kTheSourceAndDestinationAreTheSame,                                        \
     "The source and destination are the same")                                 \
   V(kTheStackWasCorruptedByMacroAssemblerCall,                                 \
     "The stack was corrupted by MacroAssembler::Call()")                       \
   V(kTooManyParametersLocals, "Too many parameters/locals")                    \
@@ skipping 77 matching lines @@
 };
 #undef ERROR_MESSAGES_CONSTANTS
 
 
 const char* GetBailoutReason(BailoutReason reason);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BAILOUT_REASON_H_