[llvm] [Nomination] Add ST representative to Security group (PR #93176)

[Dimitry Andric via llvm-commits]

DimitryAndric wrote:

As with a previous case of "self-nomination", it would be nice if there was a reference from somebody who is already known in this security-related community, who can vouch for @yroux.


https://github.com/llvm/llvm-project/pull/93176