[clang] [llvm] [RISCV] Add support for new unprivileged extensions defined in profiles spec (PR #77458)

[Luke Lau via cfe-commits]

lukel97 wrote:

@asb I got a response from https://github.com/riscv/riscv-profiles/issues/139, looks like Ziccrse, Ziccamoa, Za64rs, and Za128rs don't imply A.

https://github.com/llvm/llvm-project/pull/77458