[clang] [clang][modules] Stop eagerly reading files with diagnostic pragmas (PR #87442)

[Jan Svoboda via cfe-commits]

jansvoboda11 wrote:

@alexfh Can you check it doesn't boil down to the same thing as the issue you reported in https://reviews.llvm.org/D137213?

https://github.com/llvm/llvm-project/pull/87442