[clang] [clang] Fix CTAD not work for C++ explicit type conversion (functional annotation). (PR #75779)

[Haojian Wu via cfe-commits]

hokein wrote:

> > Thanks, I have updated the description with more details.
> 
> If it has to appear in the git log, it has to be added to the commit message. GitHub is separate from Git, so updating the opening comment of the PR won't be visible through `git`.

GitHub's "squash and merge" button already does this for us.

https://github.com/llvm/llvm-project/pull/75779