[clang] [clang][modules] Partially revert 48d0eb518 to fix -gmodules output (PR #124003)

[Michael Buch via cfe-commits]

Michael137 wrote:

FYI, this also fixed the macOS public matrix bot. Some tests where we built with `-gmodules` were crashing. Though weirdly just the clang-17 tests (which build against clang-17 aligned libc++, so might have something to do with that). Just wanted to mentioned that here in case parts of this get relanded, be sure to run the LLDB tests (or at least keep an eye out on that matrix bot)

https://github.com/llvm/llvm-project/pull/124003