Subzero: Improve non-MINIMAL string performance.

src/IceTargetLoweringMIPS32.cpp

 //===- subzero/src/IceTargetLoweringMIPS32.cpp - MIPS32 lowering ----------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 416 matching lines @@
       }
       // If this leaves us without room to consume another register,
       // leave any previously speculatively consumed registers as consumed.
       if (NumGPRRegsUsed >= MIPS32_MAX_GPR_ARG)
         continue;
       // RegHi = RegNumT::fixme(RegMIPS32::Reg_A0 + NumGPRRegsUsed);
       ++NumGPRRegsUsed;
       Variable *RegisterArg = Func->makeVariable(Ty);
       auto *RegisterArg64On32 = llvm::cast<Variable64On32>(RegisterArg);
       if (BuildDefs::dump())
-        RegisterArg64On32->setName(Func, "home_reg:" + Arg->getName(Func));
+        RegisterArg64On32->setName(Func, "home_reg:" + Arg->getName());
       RegisterArg64On32->initHiLo(Func);
       RegisterArg64On32->setIsArg();
       RegisterArg64On32->getLo()->setRegNum(RegLo);
       RegisterArg64On32->getHi()->setRegNum(RegHi);
       Arg->setIsArg(false);
       Args[I] = RegisterArg64On32;
       Context.insert<InstAssign>(Arg, RegisterArg);
       continue;
     } else {
       assert(Ty == IceType_i32);
       if (NumGPRRegsUsed >= MIPS32_MAX_GPR_ARG)
         continue;
       const auto RegNum = RegNumT::fixme(RegMIPS32::Reg_A0 + NumGPRRegsUsed);
       ++NumGPRRegsUsed;
       Variable *RegisterArg = Func->makeVariable(Ty);
       if (BuildDefs::dump()) {
-        RegisterArg->setName(Func, "home_reg:" + Arg->getName(Func));
+        RegisterArg->setName(Func, "home_reg:" + Arg->getName());
       }
       RegisterArg->setRegNum(RegNum);
       RegisterArg->setIsArg();
       Arg->setIsArg(false);
       Args[I] = RegisterArg;
       Context.insert<InstAssign>(Arg, RegisterArg);
     }
   }
 }
 
@@ skipping 853 matching lines @@
   Str << "\t.set\t"
       << "nomips16\n";
 }
 
 SmallBitVector TargetMIPS32::TypeToRegisterSet[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::TypeToRegisterSetUnfiltered[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::RegisterAliases[RegMIPS32::Reg_NUM];
 
 } // end of namespace MIPS32
 } // end of namespace Ice