[clang] [llvm] [OpenMP][Clang] Add no-loop SPMD kernel promotion (PR #205325)

[Nicole Aschenbrenner via cfe-commits]

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@@ -6983,11 +6983,11 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       // thread and team counts in the device.
       if (Args.hasFlag(options::OPT_fopenmp_assume_teams_oversubscription,
                        options::OPT_fno_openmp_assume_teams_oversubscription,
-                       /*Default=*/false))
+                       /*Default=*/TargetFastUsed))
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nicebert wrote:

Sure. I had actually planned for this, which is why I made it a separate commit :) so it's easy to split off if requested. Reworing the PR to be just the no-loop commit and adding the defaults to target-fast in a separate PR

https://github.com/llvm/llvm-project/pull/205325