Added %_Likely/%_Unlikely intrinsics (special cases of GCC's __builin_expect).

src/runtime/runtime.h

 // Copyright 2012 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_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/zone.h"
@@ skipping 70 matching lines @@
   F(DebugAsyncTaskEvent, 1, 1)                 \
   F(PromiseRejectEvent, 3, 1)                  \
   F(PromiseRevokeReject, 1, 1)                 \
   F(PromiseHasHandlerSymbol, 0, 1)             \
   F(FlattenString, 1, 1)                       \
   F(LoadMutableDouble, 2, 1)                   \
   F(TryMigrateInstance, 1, 1)                  \
   F(NotifyContextDisposed, 0, 1)               \
   F(ThrowIteratorResultNotAnObject, 1, 1)      \
   F(IncrementStatsCounter, 1, 1)               \
+  F(Likely, 1, 1)                              \
+  F(Unlikely, 1, 1)                            \
                                                \
   /* Array join support */                     \
   F(PushIfAbsent, 2, 1)                        \
   F(ArrayConcat, 1, 1)                         \
                                                \
   /* Conversions */                            \
   F(ToBool, 1, 1)                              \
   F(Typeof, 1, 1)                              \
                                                \
   F(StringToNumber, 1, 1)                      \
@@ skipping 804 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_