ARM: Use the shifter operand to merge in previous shift instructions.

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index b20b3f28f8b7c32caa12a4c3fb627620c09d4259..aa98c5b18d7199a7708613d1245f127637c49237 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -86,6 +86,13 @@ class LCodeGen: public LCodeGenBase {
   // Returns a MemOperand pointing to the high word of a DoubleStackSlot.
   MemOperand ToHighMemOperand(LOperand* op) const;
 
+  template<class LI>
+  Operand ToShiftedRightOperand(LOperand* right, LI* shift_info);
+
+  int JSShiftAmountFromLConstant(LOperand* constant) {
+    return ToInteger32(LConstantOperand::cast(constant)) & 0x1f;
+  }
+
   bool IsInteger32(LConstantOperand* op) const;
   bool IsSmi(LConstantOperand* op) const;
   Handle<Object> ToHandle(LConstantOperand* op) const;