[llvm] [AMDGPU] Add AMDGPU-specific module splitting (PR #89245)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

Note: I added the `isAddressTaken` check for the indirect calls dependency collection. I think that's a trivial addition to narrow down the set of indirectly callable functions.

https://github.com/llvm/llvm-project/pull/89245