[llvm] [AArch64][v8.5A] Omit BTI for non-addr-taken static fns in ELF (PR #135043)

[Fangrui Song via llvm-commits]

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+; RUN: llc -mtriple=aarch64-linux-gnu %s -o - | FileCheck %s --check-prefixes=CHECK,NOBTI
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MaskRay wrote:

A better name would be `bti-something` or `branch-target-enforcement-something.ll`.
internal linkage is a minor concept and it makes sense to make it a suffix instead of a prefix to improve test discoverability.

https://github.com/llvm/llvm-project/pull/135043