[clang][DebugInfo][test] Move debug-info tests from CodeGenObjCXX to DebugInfo directory (#154912)

This patch works towards consolidating all Clang debug-info into the
`clang/test/DebugInfo` directory

(https://discourse.llvm.org/t/clang-test-location-of-clang-debug-info-tests/87958).

Here we move only the `clang/test/CodeGenObjCXX` tests.

The list of files i came up with is:
1. searched for anything with `*debug-info*` in the filename
2. searched for occurrences of `debug-info-kind` in the tests

Author: Michael137