Inline Array.shift() fast path instead of using a code stub.

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 b342bf44b63c73570b60f929f5018f710c1303c6..846c25041dc84ad6eb05da808919a78c390dd313 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -4402,15 +4402,6 @@ void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
 }
 
 
-void LCodeGen::DoArrayShift(LArrayShift* instr) {
-  ASSERT(ToRegister(instr->context()).is(cp));
-  ASSERT(ToRegister(instr->object()).is(r0));
-  ASSERT(ToRegister(instr->result()).is(r0));
-  ArrayShiftStub stub(isolate(), instr->hydrogen()->kind());
-  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
-}
-
-
 void LCodeGen::DoTrapAllocationMemento(LTrapAllocationMemento* instr) {
   Register object = ToRegister(instr->object());
   Register temp = ToRegister(instr->temp());