[clang] [analyzer] use `invalidateRegions()` in `VisitGCCAsmStmt` (PR #109838)

[Balazs Benics via cfe-commits]

https://github.com/steakhal commented:

Looks correct to me.
Btw, do you think the invalidation should cause pointer escape? I have no opinion. I rarely use this api. Wdyt?

https://github.com/llvm/llvm-project/pull/109838