[clang] [llvm] [RISCV] CodeGen of RVE and ilp32e/lp64e ABIs (PR #76777)

[Nemanja Ivanovic via llvm-commits]

https://github.com/nemanjai commented:

It is not my intent to hold up approval of this patch. In addition to the minor comments I added, I plan to do some local testing but even if the testing reveals issues, they can be fixed on subsequent commits.

https://github.com/llvm/llvm-project/pull/76777