[clang] [ExtendLifetimes] Add extend lifetimes to emit fake uses from clang (PR #106724)

[Paul T Robinson via cfe-commits]

https://github.com/pogo59 commented:

I didn't really look at the tests.

Rather than saying the new options are "incompatible" with -O0, I'd say they are "ignored" at -O0, which is in fact how they are implemented. "Incompatible" suggests to me that there'd be a diagnostic, and there's no need for that.

https://github.com/llvm/llvm-project/pull/106724