[clang] [SystemZ][zOS] disable _Float16 support on z/OS (PR #145532)

[Ulrich Weigand via cfe-commits]

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@@ -76,6 +76,7 @@ class LLVM_LIBRARY_VISIBILITY SystemZTargetInfo : public TargetInfo {
     MinGlobalAlign = 16;
     HasUnalignedAccess = true;
     if (Triple.isOSzOS()) {
+      HasFloat16 = false;
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uweigand wrote:

Wouldn't this be the default anyway?

https://github.com/llvm/llvm-project/pull/145532