[llvm] [RISCV] Generate RISCVISAInfo table from RISCVFeatures.td. (PR #89955)

[Pengcheng Wang via llvm-commits]

https://github.com/wangpc-pp commented:

Add tests to `llvm/test/TableGen/riscv-target-def.td`?

https://github.com/llvm/llvm-project/pull/89955