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

[Folkert de Vries via llvm-commits]

folkertdev 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.

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