[llvm] [RISCV][POC] Recursive search for mul expansion (PR #96327)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

Could you put into a llvm-riscv-whatever tool and let it generate RISC-V tables(C++) for various use-cases?

https://github.com/llvm/llvm-project/pull/96327