[llvm] [x86] Enable indirect tail calls with more arguments (PR #137643)

[Reid Kleckner via llvm-commits]

https://github.com/rnk commented:

Thanks for the extra tests! Sorry I came up with more questions. My confidence in this code has increased, and I'd be OK to approve it after some iteration.

https://github.com/llvm/llvm-project/pull/137643