[llvm] [BOLT][AArch64] Skip gadget pacret test on RHEL8 (PR #145527)

[Kristof Beyls via llvm-commits]

kbeyls wrote:

If I understand correctly, this test has assembly as input, where we expect the exact same binary to be produced on all platforms. Also, the analyzer is expected to produce the same results, given a particular input binary, on all platforms.

For that reason, it seems to me that disabling this test on RHEL8 is the wrong fix. Would you be able to show a the input to FileCheck, so that a more meaningful diff can be produced, and investigate what the root cause is of why this test produces a different result on RHEL8?

https://github.com/llvm/llvm-project/pull/145527