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

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 9565a08ebae41a4506a2e5a09f1cf100066b5780..1bfbc4cea4894f26a72627bc6e4067a30994b307 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -2324,14 +2324,6 @@ LInstruction* LChunkBuilder::DoTransitionElementsKind(
 }
 
 
-LInstruction* LChunkBuilder::DoArrayShift(HArrayShift* instr) {
-  LOperand* object = UseFixed(instr->object(), eax);
-  LOperand* context = UseFixed(instr->context(), esi);
-  LArrayShift* result = new(zone()) LArrayShift(context, object);
-  return MarkAsCall(DefineFixed(result, eax), instr, CANNOT_DEOPTIMIZE_EAGERLY);
-}
-
-
 LInstruction* LChunkBuilder::DoTrapAllocationMemento(
     HTrapAllocationMemento* instr) {
   LOperand* object = UseRegister(instr->object());