[clang] [llvm] [RISCV][MC] MC layer support for the experimental zalasr extension (PR #79911)

[Brendan Sweeney via llvm-commits]

mehnadnerd wrote:

It has been approved to be pursued as a fast track extension (https://lists.riscv.org/g/tech-unprivileged/topic/arc_architecture_review/101951698). It has not yet been approved by the chairs.

https://github.com/llvm/llvm-project/pull/79911