Implement DoCallKeyed for arm lithium compiler.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index e6942fada14f66396ffcf32e43e4b5e60ab09868..ff260b59cd255c8ff2035775f17602f74a077a1a 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -1812,7 +1812,12 @@ void LCodeGen::DoUnaryMathOperation(LUnaryMathOperation* instr) {
 
 
 void LCodeGen::DoCallKeyed(LCallKeyed* instr) {
-  Abort("DoCallKeyed unimplemented.");
+  ASSERT(ToRegister(instr->result()).is(r0));
+
+  int arity = instr->arity();
+  Handle<Code> ic = StubCache::ComputeKeyedCallInitialize(arity, NOT_IN_LOOP);
+  CallCode(ic, RelocInfo::CODE_TARGET, instr);
+  __ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
 }