[clang] [llvm] [DirectX][DXIL] Set DXIL Version in DXIL target triple based on shader model version (PR #90809)

[Damyan Pepper via cfe-commits]

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@@ -4675,7 +4676,7 @@ bool CompilerInvocation::CreateFromArgsImpl(
   // FIXME: We shouldn't have to pass the DashX option around here
   InputKind DashX = Res.getFrontendOpts().DashX;
   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
-  llvm::Triple T(Res.getTargetOpts().Triple);
+  llvm::Triple T(llvm::Triple::normalize(Res.getTargetOpts().Triple));
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damyanp wrote:

Looks like part of this change is to normalize `Res.getTargetOpts().Triple` in many places where it is used.

Would it be possible to arrange it so that this is normalized in one place earlier on, so all users of `getTargetOpts()` can assume that it is normalized already?

https://github.com/llvm/llvm-project/pull/90809