[llvm] [BOLT][AArch64] Add indirect call promotion support (PR #184733)

[Alexey Moksyakov via llvm-commits]

yavtuk wrote:

> Are you saying that we should only implement optimizations for indirect call (blr), and ingnore optimizations for indirect branch (br)?

Yes, for complete certainty, I would like to exclude optimization or modification indirect branches, but let's see what others say. In the meantime I'll try to recheck this again.

https://github.com/llvm/llvm-project/pull/184733