[clang] [clang] Add diagnostic for usage of implicit constructor with pointer to bool convertion (PR #143990)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Thank you for working on this (and sorry for the delayed review)! Please be sure to add a release note to `clang/docs/ReleaseNotes.rst` so users know about the improved diagnostics.

https://github.com/llvm/llvm-project/pull/143990