[llvm] [RISCV] Emitting proper atomic ABI tag when Zalasr is enabled (PR #121017)

[Philip Reames via llvm-commits]

preames wrote:

FYI, I have spoken with @mehnadnerd offline.  He does not have commit access, and has asked me to land this on his behalf after approval.  I'm going to give it until Monday in case any other reviewers have comments, and then land.

https://github.com/llvm/llvm-project/pull/121017