[llvm] [RISCV] Fix More RV32 Signed Immediates (PR #120658)

[Sam Elliott via llvm-commits]

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lenary wrote:

This file has a strange name because `rv32zcibop-valid.s` contains both riscv32 and riscv64 RUN lines, which is annoying. I haven't checked how many others have the same property (or similarly for files starting `rv64`). It seems we have some `rv<ext name>.s` tests which might be better names for testcases covering both rv32 and rv64.

https://github.com/llvm/llvm-project/pull/120658