[clang] [clang] Enable the -Wdangling-capture diagnostic by default. (PR #119685)

[Haojian Wu via cfe-commits]

hokein wrote:

> Did you benchmark the impact on compile times?

I don't have concrete numbers, this warning works similarly to other -Wdangling warnings, performing only a lightweight, single-statement analysis on the annotated parameter, I believe the cost on compile times is negligible. 

https://github.com/llvm/llvm-project/pull/119685