[CMake] Add check-debuginfo-* targets

* check-debuginfo-dexter runs lit tests under debuginfo-tests/dexter/
* check-debuginfo-llgdb-tests runs lit tests under debuginfo-tests/llgdb-tests/
* ...

Reviewed By: tbosch

Differential Revision: https://reviews.llvm.org/D82605

GitOrigin-RevId: ac567eec119f7d288c6f47921b348aeea7d743cd
1 file changed