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

src/x87/lithium-x87.cc

Index: src/x87/lithium-x87.cc
diff --git a/src/x87/lithium-x87.cc b/src/x87/lithium-x87.cc
index 0dddc32b1d498e3c03bd4db6e2d125416af5ff88..1a862fd88dc7c039adf05c20d4f0de0e58a06834 100644
--- a/src/x87/lithium-x87.cc
+++ b/src/x87/lithium-x87.cc
@@ -2309,14 +2309,6 @@ 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());