Impelments IfThenElse instruction for ARM and MIPS.

runtime/vm/assembler_arm.cc

Index: runtime/vm/assembler_arm.cc
===================================================================
--- runtime/vm/assembler_arm.cc	(revision 29815)
+++ runtime/vm/assembler_arm.cc	(working copy)
@@ -2418,6 +2418,18 @@
 }
 
 
+void Assembler::AndImmediate(Register rd, Register rs, int32_t imm,
+                             Condition cond) {
+  ShifterOperand op;
+  if (ShifterOperand::CanHold(imm, &op)) {
+    and_(rd, rs, ShifterOperand(op), cond);
+  } else {
+    LoadImmediate(TMP, imm, cond);
+    and_(rd, rs, ShifterOperand(TMP), cond);
+  }
+}
+
+
 void Assembler::CompareImmediate(Register rn, int32_t value, Condition cond) {
   ShifterOperand shifter_op;
   if (ShifterOperand::CanHold(value, &shifter_op)) {