Add assembly operations with constants in optimizing compiler.

Change-Id: I5bcc35ab50d4457186effef5592a75d7f4e5b65f
diff --git a/compiler/utils/arm/assembler_arm.cc b/compiler/utils/arm/assembler_arm.cc
index 5fe8246..671ccb6 100644
--- a/compiler/utils/arm/assembler_arm.cc
+++ b/compiler/utils/arm/assembler_arm.cc
@@ -73,6 +73,11 @@
   return os;
 }
 
+ShifterOperand::ShifterOperand(uint32_t immed)
+    : type_(kImmediate), rm_(kNoRegister), rs_(kNoRegister),
+      is_rotate_(false), is_shift_(false), shift_(kNoShift), rotate_(0), immed_(immed) {
+  CHECK(immed < (1u << 12) || ArmAssembler::ModifiedImmediate(immed) != kInvalidModifiedImmediate);
+}
 
 
 uint32_t ShifterOperand::encodingArm() const {