[llvm-branch-commits] [clang] [LifetimeSafety] Mark all DeclRefExpr as usages of the corresp. origin (PR #154316)

[Gábor Horváth via llvm-branch-commits]

https://github.com/Xazax-hun commented:

> It is checked for use-after-free unless it is being written to.

I wonder if this is important if we end up using liveness analysis. I.e., I believe the value we are overwriting is not live. So, in case we only warn for the live usages, we get this check for free. (In case we are moving in that direction). 

https://github.com/llvm/llvm-project/pull/154316