A64: Synchronize with r15545.

src/hydrogen-redundant-phi.h

Index: src/hydrogen-redundant-phi.h
diff --git a/src/a64/debugger-a64.h b/src/hydrogen-redundant-phi.h
similarity index 76%
copy from src/a64/debugger-a64.h
copy to src/hydrogen-redundant-phi.h
index 50480cc268a49f53fafc1650e79d73de573524ed..6291fa5b7871e4d0612e8e680ce4e5e7db8f6685 100644
--- a/src/a64/debugger-a64.h
+++ b/src/hydrogen-redundant-phi.h
@@ -25,32 +25,29 @@
 // (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_A64_DEBUGGER_A64_H_
-#define V8_A64_DEBUGGER_A64_H_
+#ifndef V8_HYDROGEN_REDUNDANT_PHI_H_
+#define V8_HYDROGEN_REDUNDANT_PHI_H_
 
-#if defined(USE_SIMULATOR)
-
-#include "globals.h"
-#include "utils.h"
-#include "a64/constants-a64.h"
-#include "a64/simulator-a64.h"
+#include "hydrogen.h"
 
 namespace v8 {
 namespace internal {
 
 
-class Debugger : public Simulator {
+// Replace all phis consisting of a single non-loop operand plus any number of
+// loop operands by that single non-loop operand.
+class HRedundantPhiEliminationPhase : public HPhase {
  public:
-  Debugger(Decoder* decoder, FILE* stream = stdout)
-    : Simulator(decoder, NULL, stream) {}
+  explicit HRedundantPhiEliminationPhase(HGraph* graph)
+      : HPhase("H_Redundant phi elimination", graph) { }
+
+  void Run();
 
-  // Functions overloading.
-  void VisitException(Instruction* instr);
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HRedundantPhiEliminationPhase);
 };
 
 
 } }  // namespace v8::internal
 
-#endif  // USE_SIMULATOR
-
-#endif  // V8_A64_DEBUGGER_A64_H_
+#endif  // V8_HYDROGEN_REDUNDANT_PHI_H_