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

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index e7b0d5b429390f0e613d9b7b679b122e5e1ead2d..da5cece53dda6cf2182c2abfe1d32bdf0321aa0b 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -26,7 +26,6 @@ class LCodeGen;
   V(ArgumentsLength)                            \
   V(ArithmeticD)                                \
   V(ArithmeticT)                                \
-  V(ArrayShift)                                 \
   V(BitI)                                       \
   V(BoundsCheck)                                \
   V(Branch)                                     \
@@ -2282,21 +2281,6 @@ class LTransitionElementsKind V8_FINAL : public LTemplateInstruction<0, 2, 2> {
 };
 
 
-class LArrayShift V8_FINAL : public LTemplateInstruction<1, 2, 0> {
- public:
-  LArrayShift(LOperand* context, LOperand* object) {
-    inputs_[0] = context;
-    inputs_[1] = object;
-  }
-
-  LOperand* context() const { return inputs_[0]; }
-  LOperand* object() const { return inputs_[1]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(ArrayShift, "array-shift")
-  DECLARE_HYDROGEN_ACCESSOR(ArrayShift)
-};
-
-
 class LTrapAllocationMemento V8_FINAL  : public LTemplateInstruction<0, 1, 1> {
  public:
   LTrapAllocationMemento(LOperand* object,