[clang] [AArch64][FMV] Enable PAuth and BTI hardening of resolver functions (PR #141573)

[Alexandros Lamprineas via cfe-commits]

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+// RUN: %clang_cc1 -triple aarch64-linux-gnu -mbranch-target-enforce -msign-return-address=all      -emit-llvm %s -o - | FileCheck --check-prefixes=CHECK,BTI-SIGNRA %s
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labrinea wrote:

No, I am not asking existing tests to be moved, but when we add new ones they ought to be in the right place. An attempt to move existing CodeGen tests under the AArch64 folder was here https://github.com/llvm/llvm-project/pull/115818

https://github.com/llvm/llvm-project/pull/141573