[clang] [llvm] [RISCV] Support Zama16b1p0 (PR #88474)

[Craig Topper via cfe-commits]

topperc wrote:

> Can you add it to RVA23 profile?
> 
> https://github.com/llvm/llvm-project/blob/f71e25bb669d662f98823d6d81b3f918538c9239/llvm/lib/Support/RISCVISAInfo.cpp#L250-L284

It's an optional extension so I don't think it should be in the RVA23 profile.

https://github.com/llvm/llvm-project/pull/88474