ARM64: Sign extension on MemOperand for keyed ops

src/arm64/lithium-codegen-arm64.h

Index: src/arm64/lithium-codegen-arm64.h
diff --git a/src/arm64/lithium-codegen-arm64.h b/src/arm64/lithium-codegen-arm64.h
index 1d64f861537131025a0e3c93dcba6fd7921b4831..07575eca443ca6a4fe4b27ff40da329d3b44e449 100644
--- a/src/arm64/lithium-codegen-arm64.h
+++ b/src/arm64/lithium-codegen-arm64.h
@@ -229,11 +229,13 @@ class LCodeGen: public LCodeGenBase {
                                               int constant_key,
                                               ElementsKind elements_kind,
                                               int additional_index);
-  void CalcKeyedArrayBaseRegister(Register base,
-                                  Register elements,
-                                  Register key,
-                                  bool key_is_tagged,
-                                  ElementsKind elements_kind);
+  MemOperand PrepareKeyedArrayOperand(Register base,
+                                      Register elements,
+                                      Register key,
+                                      bool key_is_tagged,
+                                      ElementsKind elements_kind,
+                                      Representation representation,
+                                      int additional_index);
 
   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
                                             Safepoint::DeoptMode mode);