[llvm] [RISCV] Remove deleted AVL register defs from LiveInterval instr maps (PR #97011)

[Pengcheng Wang via llvm-commits]

wangpc-pp wrote:

> I've attached the reproducer from that test case but for some reason it needs +c to trigger the assertion, I'm not sure why.

When RVC is enabled, we may add some RA hints. I think this may be the reason.

https://github.com/llvm/llvm-project/pull/97011