[llvm] [RISCV] Fix musttail with indirect arguments by forwarding incoming pointers (PR #185094)

[Xavier Roche via llvm-commits]

xroche wrote:

> For easier reviewing it might be better to first cherry-pick the reverted commits, then add your changes on top? Now it's hard to see what you changed.

I tried, but I struggle as every file conflicts when cherry-picking. I can try to have a partial revert of my own commits added first and cherry-pick the main revert, if this make sense ?

https://github.com/llvm/llvm-project/pull/185094