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

[Luke Lau via cfe-commits]

lukel97 wrote:

Rebased on top of 79889fedc57707e99740abc1f48e6c5601d5a3f3

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