[clang] [clang][ThreadSafety] Warn when constructor is trylock (PR #95290)

[Dan McArdle via cfe-commits]

dmcardle wrote:

@AaronBallman, please take a look!

What do you think of this approach? I suppose it might be even better to enforce that the function's return type is `bool`, which would align with the [ThreadSafetyAnalysis documentation](https://clang.llvm.org/docs/ThreadSafetyAnalysis.html#try-acquire-bool-try-acquire-shared-bool).

https://github.com/llvm/llvm-project/pull/95290