This fixes the highlighting for lines without any coverage segments. I
don't have a neat way of testing this yet, but am working on it.
llvm-svn: 276906
This makes it easy to swap out the default stylesheet for a custom one.
It also shaves ~6.62 MB out of the report directory for a full coverage
build of llvm+clang.
While we're at it, prune the CSS and add tests for it.
llvm-svn: 276359