A64: Synchronize with r17635.

src/a64/lithium-a64.h

Index: src/a64/lithium-a64.h
diff --git a/src/a64/lithium-a64.h b/src/a64/lithium-a64.h
index 94fcb4b04395776273b1a5e20f15c35749f1b9fb..696956d5227bc4c3762a9e1580b24251818465d1 100644
--- a/src/a64/lithium-a64.h
+++ b/src/a64/lithium-a64.h
@@ -93,6 +93,7 @@ class LCodeGen;
   V(DivI)                                       \
   V(DoubleToIntOrSmi)                           \
   V(Drop)                                       \
+  V(Dummy)                                      \
   V(DummyUse)                                   \
   V(ElementsKind)                               \
   V(ForInCacheArray)                            \
@@ -457,6 +458,13 @@ class LDrop V8_FINAL : public LTemplateInstruction<0, 0, 0> {
 };
 
 
+class LDummy V8_FINAL : public LTemplateInstruction<1, 0, 0> {
+ public:
+  explicit LDummy() { }
+  DECLARE_CONCRETE_INSTRUCTION(Dummy, "dummy")
+};
+
+
 class LDummyUse V8_FINAL : public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LDummyUse(LOperand* value) {