Delete call normalize TargetOpts Triple in createTargetMachineForTriple

As a result any dxil triple specified in testing tools that invoke this
function is treated unmodified and intentional. Hence it is not modified
to include an implicit DXIL version - per PR feedback.

Restored change to MIR test file.

Author: Bharadwaj Yadavalli

llvm/lib/CodeGen/CommandFlags.cpp

@@ -744,7 +744,7 @@ void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
 Expected<std::unique_ptr<TargetMachine>>
 codegen::createTargetMachineForTriple(StringRef TargetTriple,
                                       CodeGenOptLevel OptLevel) {
-  Triple TheTriple(llvm::Triple::normalize(TargetTriple.str()));
+  Triple TheTriple(TargetTriple.str());
   std::string Error;
   const auto *TheTarget =
       TargetRegistry::lookupTarget(codegen::getMArch(), TheTriple, Error);

llvm/test/tools/llvm-reduce/mir/infer-triple-unknown-target.mir

@@ -1,6 +1,6 @@
 # RUN: not llvm-reduce --test FileCheck %s -o /dev/null 2>&1 | FileCheck %s
 
-# CHECK: error: unable to get target for 'omgwtfbbqcpu64-unknown-unknown', see --version and --triple.
+# CHECK: error: unable to get target for 'omgwtfbbqcpu64--', see --version and --triple.
 
 --- |
   target triple = "omgwtfbbqcpu64--"