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d51525ba36
Also enable half-precision variants of tgamma, which were previously missing. Note that unlike recent work, these builtins are not vectorized as part of this commit. Ultimately all three call into lgamma_r, which has heavy control flow (including switch statements) that would be difficult to vectorize. Additionally the lgamma_r algorithm is copyrighted to SunPro so may need a rewrite in the future anyway. There are no codegen changes (to non-SPIR-V targets) with this commit, aside from the new half builtins.