[clang] [CIR] Add verifier for CIR try op (PR #181419)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

Seems alright to me.  I assume `getHandlerRegions` isn't expensive enough to bother with caching? 

https://github.com/llvm/llvm-project/pull/181419