Optimize Smi keys for KeyedLoads

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index c871a57a245dc2f762e3ed2431849b53e4851117..d380f4bcad459c54486abee0cf40ac8302d94e5f 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -132,6 +132,15 @@ class LCodeGen BASE_EMBEDDED {
   void DoParallelMove(LParallelMove* move);
   void DoGap(LGap* instr);
 
+  MemOperand PrepareKeyedOperand(Register key,
+                                 Register base,
+                                 bool key_is_constant,
+                                 int constant_key,
+                                 int element_size,
+                                 int shift_size,
+                                 int additional_index,
+                                 int additional_offset);
+
   // Emit frame translation commands for an environment.
   void WriteTranslation(LEnvironment* environment, Translation* translation);