[llvm] X86: Fix win64 tail call regression for tail call to loaded pointer (PR #158055)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

Thanks, I can confirm that this at least fixes the one case of build breakage from https://github.com/llvm/llvm-project/pull/156880 that I had narrowed down. (I ran into breakage in a couple more places as well, but reproducing those cases take a notable amount of time.)

https://github.com/llvm/llvm-project/pull/158055