[clang] [Modules] Add -cc1 -flate-module-map-file to load module maps after PCMs (PR #88893)

[Ilya Biryukov via cfe-commits]

ilya-biryukov wrote:

@ChuanqiXu9 thanks for taking a look! Makes sense to give others a chance to chime in, I will wait for more comments.

https://github.com/llvm/llvm-project/pull/88893