[clang] [CIR] Emit lifetime markers for automatic variables (PR #206695)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

I don't see anything concerning, and the test itself seems reasonable enough, but this is something that @andykaylor should make sure he approves of 

https://github.com/llvm/llvm-project/pull/206695