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

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic commented:

The mechanism for tracking the call from ISel through the assembler seems generally fine.  Alternatively, you could add an operand to call instructions, but I don't see any reason to prefer that.

https://github.com/llvm/llvm-project/pull/121516