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

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

If we can’t get this one landed soon, I’d like to revert https://github.com/llvm/llvm-project/pull/156880 to unbreak things.

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