[llvm] [AArch64] Make IFUNC opt-in rather than opt-out. (PR #171648)

[Anton Korobeynikov via llvm-commits]

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@@ -769,7 +769,7 @@ class Triple {
   bool isOSGlibc() const {
     return (getOS() == Triple::Linux || getOS() == Triple::KFreeBSD ||
             getOS() == Triple::Hurd) &&
-           !isAndroid() && !isMusl();
+           !isAndroid() && !isMusl() && getEnvironment() != Triple::PAuthTest;
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asl wrote:

Please add comment that pauthtest as of now implies not particular libc implementation

https://github.com/llvm/llvm-project/pull/171648