clang/test/lit.cfg: Remove get_llc_props. check-clang itself no longer invokes llc.

Only a few tests depend on llc yet.
[CMake] clangDriver: Move LLVM stuff in target_link_library to LLVM_LINK_COMPONENTS.
ubsan: Fix typo in 'TypeCheck/vptr.cpp' test to resolve 32bit failure.
[CMake] clang/lib: Satisfy dependencies to add *actually used* libraries on target_link_libraries() and LLVM_LINK_COMPONENTS.

I will prune redundant dependencies later.