[llvm] [BOLT]Identify indirect call (PR #123305)

[Paschalis Mpeis via llvm-commits]

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+## This test checks that indirect tail call is properly identified by BOLT on aarch64.
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paschalis-mpeis wrote:

Can you add a few more details here, like that this is when that CFI is in place without any stack changes between the CFI and the indirect branch?

https://github.com/llvm/llvm-project/pull/123305