Synchronize with r15701.

src/hydrogen-deoptimizing-mark.h

Index: src/hydrogen-deoptimizing-mark.h
diff --git a/src/hydrogen-infer-representation.h b/src/hydrogen-deoptimizing-mark.h
similarity index 75%
copy from src/hydrogen-infer-representation.h
copy to src/hydrogen-deoptimizing-mark.h
index 7c605696c4b956152bdd9dfc74c83e80569e3714..7d6e6e4bda3020cc9d3118060e0723054f17f9a6 100644
--- a/src/hydrogen-infer-representation.h
+++ b/src/hydrogen-deoptimizing-mark.h
@@ -25,8 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef V8_HYDROGEN_INFER_REPRESENTATION_H_
-#define V8_HYDROGEN_INFER_REPRESENTATION_H_
+#ifndef V8_HYDROGEN_DEOPTIMIZING_MARK_H_
+#define V8_HYDROGEN_DEOPTIMIZING_MARK_H_
 
 #include "hydrogen.h"
 
@@ -34,24 +34,23 @@ namespace v8 {
 namespace internal {
 
 
-class HInferRepresentationPhase : public HPhase {
+// Mark all blocks that are dominated by an unconditional soft deoptimize to
+// prevent code motion across those blocks.
+class HPropagateDeoptimizingMarkPhase : public HPhase {
  public:
-  explicit HInferRepresentationPhase(HGraph* graph)
-      : HPhase("H_Infer representations", graph),
-        worklist_(8, zone()),
-        in_worklist_(graph->GetMaximumValueID(), zone()) { }
+  explicit HPropagateDeoptimizingMarkPhase(HGraph* graph)
+      : HPhase("H_Propagate deoptimizing mark", graph) { }
 
   void Run();
-  void AddToWorklist(HValue* current);
 
  private:
-  ZoneList<HValue*> worklist_;
-  BitVector in_worklist_;
+  void MarkAsDeoptimizing();
+  void NullifyUnreachableInstructions();
 
-  DISALLOW_COPY_AND_ASSIGN(HInferRepresentationPhase);
+  DISALLOW_COPY_AND_ASSIGN(HPropagateDeoptimizingMarkPhase);
 };
 
 
 } }  // namespace v8::internal
 
-#endif  // V8_HYDROGEN_INFER_REPRESENTATION_H_
+#endif  // V8_HYDROGEN_DEOPTIMIZING_MARK_H_