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

[Wang Pengcheng via cfe-commits]

wangpc-pp wrote:

> Side note: shouldn't we also update `compiler-rt/lib/builtins/riscv/{save, restore}.S`? E.g. with something like this:
>  [...]
> (I don't remember why exactly since I did it a long time ago, but for some reason I do have this patch in my LLVM fork, so it probably was necessary for _something_.)

Oh, it may be about stack alignment issue for libcalls. I may have fixed it.
As for your diffs, it seems that you only handle the `__riscv_save/restore_[2|1|0]`, which is incomplete. And the code is not different with non-rve cases?

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