ARM: Implement GetCachedArrayIndex in the lithium code generator.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 82de5d3e186b0601eae6b344bcb7daf88b559712..903f77bbf0469497e0dace4aba4cccbd8b64b227 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -1491,6 +1491,15 @@ LInstruction* LChunkBuilder::DoHasInstanceType(HHasInstanceType* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
+    HGetCachedArrayIndex* instr)  {
+  ASSERT(instr->value()->representation().IsTagged());
+  LOperand* value = UseRegister(instr->value());
+
+  return DefineAsRegister(new LGetCachedArrayIndex(value));
+}
+
+
 LInstruction* LChunkBuilder::DoHasCachedArrayIndex(
     HHasCachedArrayIndex* instr) {
   ASSERT(instr->value()->representation().IsTagged());