[C++20] [Modules] Allow to compile a pcm with and without -fPIC seperately We can compile a module unit in 2 phase compilaton: ``` clang++ -std=c++20 a.cppm --precompile -o a.pcm clang++ -std=c++20 a.pcm -c -o a.o ``` And it is a general requirement that we need to compile a translation unit with and without -fPIC for static and shared libraries. But for C++20 modules with 2 phase compilation, it may be waste of time to compile them 2 times completely. It may be fine to generate one BMI and compile it with and without -fPIC seperately. e.g., ``` clang++ -std=c++20 a.cppm --precompile -o a.pcm clang++ -std=c++20 a.pcm -c -o a.o clang++ -std=c++20 a.pcm -c -fPIC -o a-PIC.o ``` Then we can save the time to parse a.cppm repeatedly.
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