[clang] [clang][modules-driver] Add dependency scan and dependency graph (PR #152770)

[Mikael Holmen via cfe-commits]

mikaelholmen wrote:

Hello @naveen-seth 

Compiling with ```-DBUILD_SHARED_LIBS=ON``` fails with this patch:
```
FAILED: lib/libclangDriver.so.23.0git 
[...]
ld.lld: error: undefined symbol: pthread_create
>>> referenced by ModulesDriver.cpp
>>>               tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ModulesDriver.cpp.o:(std::thread::_M_thread_deps_never_run())

ld.lld: error: undefined symbol: pthread_join
>>> referenced by ModulesDriver.cpp
>>>               tools/clang/lib/Driver/CMakeFiles/obj.clangDriver.dir/ModulesDriver.cpp.o:(std::thread::_M_thread_deps_never_run())
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
```

https://github.com/llvm/llvm-project/pull/152770