[Clang] Rename OffloadArch::UNUSED to UNUSED_ to avoid macro collisions (#174528) OffloadArch uses an enumerator named `UNUSED`, which is a very common macro name in external codebases (e.g. Mesa defines UNUSED as an attribute helper). If such a macro is visible when including clang/Basic/OffloadArch.h, the preprocessor expands the token inside the enum and breaks compilation of the installed Clang headers. Rename the enumerator to `UNUSED_` and update all in-tree references. This is a spelling-only change (no behavioral impact) and mirrors the existing approach used for SM_32_ to avoid macro clashes.
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