[clang] [clang-tools-extra] [clang-query] Allow for trailing comma in matchers (PR #148018)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Yeah, I think I'm okay with this. It's a bit different from C++, but the difference seems sufficiently useful and the amount of pain with switching between the two DSLs seems pretty minimal.

I did have a request for some additional test coverage though.

https://github.com/llvm/llvm-project/pull/148018