[clang] [Coverage] Map regions from system headers (PR #76950)

[via cfe-commits]

mhaehnel wrote:

Your revert just masks the underlying issue. What you do now is that you *can* specify `-system-headers-coverage` but the compiler will not actually provide coverage data for system headers because the flag is ignored.  So specifying the switch becomes meaningless. 

https://github.com/llvm/llvm-project/pull/76950