[llvm] [RISCV] Generate RISCVISAInfo in JSON format from RISCVFeatures.td. (PR #90426)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

Is there precedent for supporting this kind of use case in LLVM? This seems like it should really be the responsibility of a RISC-V International tool.

https://github.com/llvm/llvm-project/pull/90426