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

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index c2d602be656b681fe9a9333fbf604a62afbc49d6..d468f6970cd9553d91572cd42d8d451d5c5ae210 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -4298,15 +4298,6 @@ void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
 }
 
 
-void LCodeGen::DoArrayShift(LArrayShift* instr) {
-  ASSERT(ToRegister(instr->context()).is(esi));
-  ASSERT(ToRegister(instr->object()).is(eax));
-  ASSERT(ToRegister(instr->result()).is(eax));
-  ArrayShiftStub stub(isolate(), instr->hydrogen()->kind());
-  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
-}
-
-
 void LCodeGen::DoStringCharCodeAt(LStringCharCodeAt* instr) {
   class DeferredStringCharCodeAt V8_FINAL : public LDeferredCode {
    public: