[clang] [llvm] [HLSL] Add -HV option translation to clang-dxc.exe (PR #83938)

[Chris B via cfe-commits]

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@@ -8545,6 +8545,11 @@ def dxc_entrypoint : Option<["--", "/", "-"], "E", KIND_JOINED_OR_SEPARATE>,
                      Group<dxc_Group>,
                      Visibility<[DXCOption]>,
                      HelpText<"Entry point name">;
+def dxc_hlsl_version : Option<["/", "-"], "HV", KIND_JOINED_OR_SEPARATE>,
+                     Group<dxc_Group>,
+                     Visibility<[DXCOption]>,
+                     HelpText<"HLSL Version">,
+                     NormalizedValues<["2016", "2017", "2018", "2021", "202x"]>;
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llvm-beanz wrote:

In the current state of this patch I don't think this does anything. I don't think the `Values` or `NormalizedValues` stuff really do anything (other than maybe populating the help spew) if you're not using the marshalling infrastructure (https://clang.llvm.org/docs/InternalsManual.html#option-marshalling-infrastructure).

We don't currently have a `DriverOptions` construct, so driver-only options can't use the marshalling stuff, which is unfortunate.

I think for the purposes of this change we should probably go with the direction in this PR and revisit marshalling later.

https://github.com/llvm/llvm-project/pull/83938