[clang] [Format] Configure ASSIGN_OR_RETURN macros for Google style (PR #169037)

[Ilya Biryukov via cfe-commits]

ilya-biryukov wrote:

> Can you link to some documentation for these macros? And maybe adapt the commit message. If you want to attribute it to a different person, commit in their name. (git commit --author="Foo bar <foo at bar.com>")


Done, some examples are in the description and the commit now has the right author. 


https://github.com/llvm/llvm-project/pull/169037