[clang] [clang] Expose MC target options through -mllvm (PR #210087)

[Fangrui Song via cfe-commits]

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@@ -0,0 +1,28 @@
+// REQUIRES: x86-registered-target
+//
+// Clang registers LLVM's machine-code target options (via
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MaskRay wrote:

`///` for regular prose  comments.

https://github.com/llvm/llvm-project/pull/210087