Selectively invert ICMP operands for better address optimization

src/IceTargetLoweringX86Base.h

 //===- subzero/src/IceTargetLoweringX86Base.h - x86 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 271 matching lines @@
   /// Legalizes Addr w.r.t. SandboxingType. The exact type of legalization
   /// varies for different <Target, SandboxingType> tuples.
   bool legalizeOptAddrForSandbox(OptAddr *Addr) {
     return dispatchToConcrete(
         &Traits::ConcreteTarget::legalizeOptAddrForSandbox, std::move(Addr));
   }
   // Builds information for a canonical address expresion:
   //   <Relocatable + Offset>(Base, Index, Shift)
   X86OperandMem *computeAddressOpt(const Inst *Instr, Type MemType,
                                    Operand *Addr);
+  void doAddressOptOther() override;
   void doAddressOptLoad() override;
   void doAddressOptStore() override;
   void doMockBoundsCheck(Operand *Opnd) override;
   void randomlyInsertNop(float Probability,
                          RandomNumberGenerator &RNG) override;
 
   /// Naive lowering of cmpxchg.
   void lowerAtomicCmpxchg(Variable *DestPrev, Operand *Ptr, Operand *Expected,
                           Operand *Desired);
   /// Attempt a more optimized lowering of cmpxchg. Returns true if optimized.
@@ skipping 866 matching lines @@
 
   explicit TargetHeaderX86(GlobalContext *Ctx) : TargetHeaderLowering(Ctx) {}
 };
 
 } // end of namespace X86NAMESPACE
 } // end of namespace Ice
 
 #include "IceTargetLoweringX86BaseImpl.h"
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX86BASE_H