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

src/hydrogen.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_HYDROGEN_H_
 #define V8_HYDROGEN_H_
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 2182 matching lines @@
   F(DebugBreakInOptimizedCode)         \
   F(StringCharCodeAt)                  \
   F(StringAdd)                         \
   F(SubString)                         \
   F(StringCompare)                     \
   F(RegExpExec)                        \
   F(RegExpConstructResult)             \
   F(GetFromCache)                      \
   F(NumberToString)                    \
   F(DebugIsActive)                     \
+  F(Likely)                            \
+  F(Unlikely)                          \
   /* Typed Arrays */                   \
   F(TypedArrayInitialize)              \
   F(DataViewInitialize)                \
   F(MaxSmi)                            \
   F(TypedArrayMaxSizeInHeap)           \
   F(ArrayBufferViewGetByteLength)      \
   F(ArrayBufferViewGetByteOffset)      \
   F(TypedArrayGetLength)               \
   /* ArrayBuffer */                    \
   F(ArrayBufferGetByteLength)          \
@@ skipping 820 matching lines @@
   }
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_