[clang] [LifetimeSafety] Track moved declarations to prevent false positives (PR #170007)

[Utkarsh Saxena via cfe-commits]

usx95 wrote:

Regarding `std::move(cond?a:b)`, tracking "moved origins" instead of "moved decls" once they are converted to a r-value-ref looks good to me.

https://github.com/llvm/llvm-project/pull/170007