[llvm] Reapply "[aarch64][win] Add support for import call optimization (equivalent to MSVC /d2ImportCallOptimization) (#121516)" (PR #122777)

[Daniel Paoliello via llvm-commits]

dpaoliello wrote:

Seems as if `executePostLayoutBinding` is not being called?
Looking at `MCAssembler::layout` that's possible if the context contains an error https://github.com/llvm/llvm-project/blob/21ade5ae2978b7b809b59b70d63099c87b36dc61/llvm/lib/MC/MCAssembler.cpp#L926
Which makes sense given the scenario being run.

I'll look into a fix tomorrow.

https://github.com/llvm/llvm-project/pull/122777