[F#]Type declarations in F# are shown as not covered

[SteveGilham]

This is the same issue as OpenCover issue #615 -- the compiler generates many functions (such as comparison operations) which show in the IL but not in the source While I can apply a class-level exclusion (as here for OpenCover) that would also exclude any methods I add to the type in a with member extension; otherwise this requires the adding same sort of meaningless rote unit tests for the compiler code as covering auto-properties does.