[llvm] [LoongArch] Fix musttail with indirect arguments by forwarding incoming pointers (PR #198965)

[Cullen Rhodes via llvm-commits]

c-rhodes wrote:

sorry but given this is based on the RISC-V fix (which isn't being backported) and there's already been a revert I think it's best to give this more time on main for testing. We're late in the 22 release cycle with 22.1.7 tomorrow so it's best this waits til 23.

https://github.com/llvm/llvm-project/pull/198965