[llvm] [RISCV] Try to disassemble 48-bit and larger instructions as 32-bit instructions first. (PR #175122)

[Sam Elliott via llvm-commits]

lenary wrote:

I'm not sure this is a great way forwards, but I don't know what to do here that's better than this. I'll think about it overnight.

I do see how it gets us out of a bind with that vendor extension. I think it might cause more issues down the road with other long instructions, or if the long instruction scheme changes.

https://github.com/llvm/llvm-project/pull/175122