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

src/compiler/js-intrinsic-lowering.h

Index: src/compiler/js-intrinsic-lowering.h
diff --git a/src/compiler/js-intrinsic-lowering.h b/src/compiler/js-intrinsic-lowering.h
index 35fb66147b1262a9883ce8eb162673d02c5d6a62..92c75f5161bac14ef95918765f952a4cdff2730a 100644
--- a/src/compiler/js-intrinsic-lowering.h
+++ b/src/compiler/js-intrinsic-lowering.h
@@ -5,6 +5,7 @@
 #ifndef V8_COMPILER_JS_INTRINSIC_LOWERING_H_
 #define V8_COMPILER_JS_INTRINSIC_LOWERING_H_
 
+#include "src/compiler/common-operator.h"
 #include "src/compiler/graph-reducer.h"
 #include "src/compiler/simplified-operator.h"
 
@@ -44,6 +45,7 @@ class JSIntrinsicLowering FINAL : public Reducer {
   Reduction ReduceSeqStringGetChar(Node* node, String::Encoding encoding);
   Reduction ReduceSeqStringSetChar(Node* node, String::Encoding encoding);
   Reduction ReduceStringGetLength(Node* node);
+  Reduction ReduceUnLikely(Node* node, BranchHint hint);
   Reduction ReduceValueOf(Node* node);
 
   Reduction Change(Node* node, const Operator* op);