[Driver] Fix codeview-column-info on macOS

macOS home directory paths begin with /Users, and clang-cl interprets
the /U portion as a macro undefine rather than a path, causing test
failures on macOS. Use a -- to explicitly treat the input file as a path
and fix the test.

This effectively reverts r326168 and adds an alternative fix.

llvm-svn: 326171