Removes const qualification for two methods in TargetDataLowering.

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.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the TargetLoweringMIPS32 class, which consists almost
@@ skipping 659 matching lines @@
 
 TargetDataMIPS32::TargetDataMIPS32(GlobalContext *Ctx)
     : TargetDataLowering(Ctx) {}
 
 void TargetDataMIPS32::lowerGlobal(const VariableDeclaration &Var) const {
   (void)Var;
   llvm::report_fatal_error("Not yet implemented");
 }
 
 void TargetDataMIPS32::lowerGlobals(
-    std::unique_ptr<VariableDeclarationList> Vars) const {
+    std::unique_ptr<VariableDeclarationList> Vars) {
   switch (Ctx->getFlags().getOutFileType()) {
   case FT_Elf: {
     ELFObjectWriter *Writer = Ctx->getObjectWriter();
     Writer->writeDataSection(*Vars, llvm::ELF::R_MIPS_GLOB_DAT);
   } break;
   case FT_Asm:
   case FT_Iasm: {
     const IceString &TranslateOnly = Ctx->getFlags().getTranslateOnly();
     OstreamLocker L(Ctx);
     for (const VariableDeclaration *Var : *Vars) {
       if (GlobalContext::matchSymbolName(Var->getName(), TranslateOnly)) {
         lowerGlobal(*Var);
       }
     }
   } break;
   }
 }
 
-void TargetDataMIPS32::lowerConstants() const {
+void TargetDataMIPS32::lowerConstants() {
   if (Ctx->getFlags().getDisableTranslation())
     return;
   llvm::report_fatal_error("Not yet implemented");
 }
 
 TargetHeaderMIPS32::TargetHeaderMIPS32(GlobalContext *Ctx)
     : TargetHeaderLowering(Ctx) {}
 
 } // end of namespace Ice