A64: Synchronize with r16024.

src/hydrogen-mark-deoptimize.h

Index: src/hydrogen-mark-deoptimize.h
diff --git a/src/hydrogen-minus-zero.h b/src/hydrogen-mark-deoptimize.h
similarity index 64%
copy from src/hydrogen-minus-zero.h
copy to src/hydrogen-mark-deoptimize.h
index d23ec1196b3419cdc06e20aa3e12688979306009..0aa2c2c754069e4cf658429707a02ffe8fe4fa92 100644
--- a/src/hydrogen-minus-zero.h
+++ b/src/hydrogen-mark-deoptimize.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_MINUS_ZERO_H_
-#define V8_HYDROGEN_MINUS_ZERO_H_
+#ifndef V8_HYDROGEN_MARK_DEOPTIMIZE_H_
+#define V8_HYDROGEN_MARK_DEOPTIMIZE_H_
 
 #include "hydrogen.h"
 
@@ -34,23 +34,30 @@ 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_