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

[Hans Wennborg via llvm-commits]

zmodem wrote:

Thanks for the review! This should probably be landed as separate patches, but let's keep it as one for the review.

I'd appreciate extra eyes on the code from `X86tcret_1reg` (see the XXX comment).

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