[TargetRegistry] Accept Triple in createTargetMachine() (NFC) (#130940)

This avoids doing a Triple -> std::string -> Triple round trip in lots
of places, now that the Module stores a Triple.

Author: nikic

bolt/lib/Passes/AsmDump.cpp

@@ -143,7 +143,7 @@ void dumpFunction(const BinaryFunction &BF) {
                         std::move(MCEInstance.MCE), std::move(MAB)));
   AsmStreamer->initSections(true, *BC.STI);
   std::unique_ptr<TargetMachine> TM(BC.TheTarget->createTargetMachine(
-      BC.TripleName, "", "", TargetOptions(), std::nullopt));
+      *BC.TheTriple, "", "", TargetOptions(), std::nullopt));
   std::unique_ptr<AsmPrinter> MAP(
       BC.TheTarget->createAsmPrinter(*TM, std::move(AsmStreamer)));
 

clang/lib/CodeGen/BackendUtil.cpp

@@ -595,7 +595,7 @@ static void setCommandLineOpts(const CodeGenOptions &CodeGenOpts) {
 void EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
   // Create the TargetMachine for generating code.
   std::string Error;
-  std::string Triple = TheModule->getTargetTriple().str();
+  const llvm::Triple &Triple = TheModule->getTargetTriple();
   const llvm::Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
   if (!TheTarget) {
     if (MustCreateTM)