clang/tools/driver/Makefile: Quick fix corresponding to r205181.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@205189 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: Solve issues found and fixed by clang-tidy.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@205193 91177308-0d34-0410-b5e6-96231b3b80d8