[clang] [llvm] Implement a subset of builtin_cpu_supports() features (PR #82809)

[Amy Kwan via cfe-commits]

================
@@ -364,7 +364,14 @@ class LLVM_LIBRARY_VISIBILITY PPCTargetInfo : public TargetInfo {
   // have Glibc since it is Glibc that provides the HWCAP[2] in the auxv.
   static constexpr int MINIMUM_AIX_OS_MAJOR = 7;
   static constexpr int MINIMUM_AIX_OS_MINOR = 2;
-  bool supportsCpuSupports() const override { return getTriple().isOSGlibc(); }
+  bool supportsCpuSupports() const override {
----------------
amy-kwan wrote:

This sounds reasonable to me, thanks!

https://github.com/llvm/llvm-project/pull/82809