A64: Synchronize with r16024.

src/hydrogen-mark-deoptimize.h

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-#ifndef V8_HYDROGEN_MINUS_ZERO_H_
-#define V8_HYDROGEN_MINUS_ZERO_H_
+#ifndef V8_HYDROGEN_MARK_DEOPTIMIZE_H_
+#define V8_HYDROGEN_MARK_DEOPTIMIZE_H_
 
 #include "hydrogen.h"
 
 namespace v8 {
 namespace internal {
 
 
-class HComputeMinusZeroChecksPhase : public HPhase {
+// Compute DeoptimizeOnUndefined flag for phis.  Any phi that can reach a use
+// with DeoptimizeOnUndefined set must have DeoptimizeOnUndefined set.
+// Currently only HCompareNumericAndBranch, with double input representation,
+// has this flag set.  The flag is used by HChange tagged->double, which must
+// deoptimize if one of its uses has this flag set.
+class HMarkDeoptimizeOnUndefinedPhase : public HPhase {
  public:
-  explicit HComputeMinusZeroChecksPhase(HGraph* graph)
-      : HPhase("H_Compute minus zero checks", graph),
-        visited_(graph->GetMaximumValueID(), zone()) { }
+  explicit HMarkDeoptimizeOnUndefinedPhase(HGraph* graph)
+      : HPhase("H_Mark deoptimize on undefined", graph),
+        worklist_(16, zone()) {}
 
   void Run();
 
  private:
-  void PropagateMinusZeroChecks(HValue* value);
+  void ProcessPhi(HPhi* phi);
 
-  BitVector visited_;
+  // Preallocated worklist used as an optimization so we don't have
+  // to allocate a new ZoneList for every ProcessPhi() invocation.
+  ZoneList<HPhi*> worklist_;
 
-  DISALLOW_COPY_AND_ASSIGN(HComputeMinusZeroChecksPhase);
+  DISALLOW_COPY_AND_ASSIGN(HMarkDeoptimizeOnUndefinedPhase);
 };
 
 
 } }  // namespace v8::internal
 
-#endif  // V8_HYDROGEN_MINUS_ZERO_H_
+#endif  // V8_HYDROGEN_MARK_DEOPTIMIZE_H_