[SubZero] Implement address optimization for MIPS

src/IceTargetLoweringMIPS32.h

 //===- subzero/src/IceTargetLoweringMIPS32.h - MIPS32 lowering ---*- C++-*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 608 matching lines @@
   static constexpr uint32_t CHAR_BITS = 8;
   static constexpr uint32_t INT32_BITS = 32;
   size_t SpillAreaSizeBytes = 0;
   size_t FixedAllocaSizeBytes = 0;
   size_t FixedAllocaAlignBytes = 0;
   size_t PreservedRegsSizeBytes = 0;
 
 private:
   ENABLE_MAKE_UNIQUE;
 
+  OperandMIPS32Mem *formAddressingMode(Type Ty, Cfg *Func,
+                                       const CfgNode *LdStNode,
+                                       const Inst *LdSt, Operand *Base);
+
   class ComputationTracker {
   public:
     ComputationTracker() = default;
     ~ComputationTracker() = default;
 
     void forgetProducers() { KnownComputations.clear(); }
     void recordProducers(CfgNode *Node);
 
     const Inst *getProducerOf(const Operand *Opnd) const {
       auto *Var = llvm::dyn_cast<Variable>(Opnd);
@@ skipping 87 matching lines @@
   explicit TargetHeaderMIPS32(GlobalContext *Ctx);
 
 private:
   ~TargetHeaderMIPS32() = default;
 };
 
 } // end of namespace MIPS32
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGMIPS32_H