[CMake] Migrate LLVMParseArguments to CMakeParseArguments.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199901 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] Parameterize MODULE and SHARED in add_clang_library().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199902 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] Move LIBCLANG_BUILD_STATIC above. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199903 91177308-0d34-0410-b5e6-96231b3b80d8