Avoid unintentional optimization of hot builtins by TurboFan.

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 22 matching lines @@
   V(kBadValueContextForArgumentsObjectValue,                                   \
     "Bad value context for arguments object value")                            \
   V(kBadValueContextForArgumentsValue,                                         \
     "Bad value context for arguments value")                                   \
   V(kBailedOutDueToDependencyChange, "Bailed out due to dependency change")    \
   V(kBailoutWasNotPrepared, "Bailout was not prepared")                        \
   V(kBinaryStubGenerateFloatingPointCode,                                      \
     "BinaryStub_GenerateFloatingPointCode")                                    \
   V(kBothRegistersWereSmisInSelectNonSmi,                                      \
     "Both registers were smis in SelectNonSmi")                                \
+  V(kBuiltinFunctionCannotBeOptimized, "Builtin function cannot be optimized") \
   V(kCallToAJavaScriptRuntimeFunction,                                         \
     "Call to a JavaScript runtime function")                                   \
   V(kCannotTranslatePositionInChangedArea,                                     \
     "Cannot translate position in changed area")                               \
   V(kClassLiteral, "Class literal")                                            \
   V(kCodeGenerationFailed, "Code generation failed")                           \
   V(kCodeObjectNotProperlyPatched, "Code object not properly patched")         \
   V(kCompoundAssignmentToLookupSlot, "Compound assignment to lookup slot")     \
   V(kComputedPropertyName, "Computed property name")                           \
   V(kContextAllocatedArguments, "Context-allocated arguments")                 \
@@ skipping 286 matching lines @@
   ERROR_MESSAGES_LIST(ERROR_MESSAGES_CONSTANTS) kLastErrorMessage
 };
 #undef ERROR_MESSAGES_CONSTANTS
 
 
 const char* GetBailoutReason(BailoutReason reason);
 }
 }  // namespace v8::internal
 
 #endif  // V8_BAILOUT_REASON_H_