A64: Synchronize with r18581.

src/a64/frames-a64.cc

Index: src/a64/frames-a64.cc
diff --git a/src/a64/frames-a64.cc b/src/a64/frames-a64.cc
index fc0ecb499594f06731abe87b29ab6df7f7f82ca0..56d2e26b7200ec67b9a866cfe0bd493a6ad22e9c 100644
--- a/src/a64/frames-a64.cc
+++ b/src/a64/frames-a64.cc
@@ -46,6 +46,12 @@ Register StubFailureTrampolineFrame::fp_register() { return v8::internal::fp; }
 Register StubFailureTrampolineFrame::context_register() { return cp; }
 
 
+Object*& ExitFrame::constant_pool_slot() const {
+  UNREACHABLE();
+  return Memory::Object_at(NULL);
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64