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

[Haibo Jiang via llvm-commits]

Jianghibo wrote:

> hello, do we store the status flag when createCmpJNEWithReg is used?

We do not store/restore NZCV around createCmpJNEWithReg. The current
use is only in call ICP, immediately guarding a direct call/tail call, so NZCV
does not need to be preserved across the original call site under the ABI.

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