[SubZero] Implement address optimization for MIPS

src/IceTargetLoweringMIPS32.h

Index: src/IceTargetLoweringMIPS32.h
diff --git a/src/IceTargetLoweringMIPS32.h b/src/IceTargetLoweringMIPS32.h
index b555b9bcf6ae62b5afca1f6b00bc24b3921b5350..8232a2efb67b31402e594efe16dbc6db385dc2e1 100644
--- a/src/IceTargetLoweringMIPS32.h
+++ b/src/IceTargetLoweringMIPS32.h
@@ -626,6 +626,10 @@ protected:
 private:
   ENABLE_MAKE_UNIQUE;
 
+  OperandMIPS32Mem *formAddressingMode(Type Ty, Cfg *Func,
+                                       const CfgNode *LdStNode,
+                                       const Inst *LdSt, Operand *Base);
+
   class ComputationTracker {
   public:
     ComputationTracker() = default;