[Issue 17923] New: code coverage improvements

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17923

          Issue ID: 17923
           Summary: code coverage improvements
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: code at dawg.eu

- branch coverage support

  There might be more than one expression on a single line, better coverage
tools support branch coverage.

- count unittests as non-code or at least offer an option

- allow to mark regions as non-reachable via // COV_EXCL_START/STOP comments

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