[llvm] [TLI] Add support for lgamma libcall. (PR #114536)

[Matt Arsenault via llvm-commits]

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@@ -334,6 +335,7 @@ static void initializeLibCalls(TargetLibraryInfoImpl &TLI, const Triple &T,
     TLI.setUnavailable(LibFunc_frexpl);
     TLI.setUnavailable(LibFunc_hypotl);
     TLI.setUnavailable(LibFunc_ldexpl);
+    TLI.setUnavailable(LibFunc_lgammal);
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arsenm wrote:

As a pre-commit can you add new baseline TLI checker tests for the windows and linux cases? This is untested, and this is a problem in every one of these new libcall patches. 

https://github.com/llvm/llvm-project/pull/114536