[clang] [Clang] Add fake use emission to Clang with -fextend-lifetimes (PR #110102)

[Stephen Tozer via cfe-commits]

SLTozer wrote:

I think the forward fix has been identified, and importantly it will take a bit longer to revert than to submit the fix (adding triples to the tests), because there are 4 commits that need to be reverted and I need to run a quick build to ensure that nothing is broken by the revert itself - I'm running that build right now, but will push the fix commit up while that build is running since that might fix the problem sooner.

https://github.com/llvm/llvm-project/pull/110102