ClangCodeGenTests: Quick fix to USEDLIBS. clangCodeGen requires, at least, AST, Basic, Frontend, and Lex.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216509 91177308-0d34-0410-b5e6-96231b3b80d8
ClangCodeGenTests: Reorder libdeps.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216514 91177308-0d34-0410-b5e6-96231b3b80d8
[CMake] ClangCodeGenTests: Add Core. It's referenced by the test.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216515 91177308-0d34-0410-b5e6-96231b3b80d8
ClangCodeGenTests: Prune redundant libdeps.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@216516 91177308-0d34-0410-b5e6-96231b3b80d8