[clang] [Clang] Rename OffloadArch::UNUSED to UNUSED_ to avoid macro collisions (PR #174528)

[Shilei Tian via cfe-commits]

================
@@ -175,7 +175,8 @@ void NVPTXTargetInfo::getTargetDefines(const LangOptions 
&Opts,
 
   // Skip setting architecture dependent macros if undefined.
   if (!IsNVIDIAOffloadArch(GPU))
-    return;
+    if (GPU == OffloadArch::Unused && !HostTarget)
----------------
shiltian wrote:

I'd make it in a separate PR and keep this one as a completely NFC.

https://github.com/llvm/llvm-project/pull/174528
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