In the absence of further comments I'm going to apply this and back-patch it so we can get a significant improvement in how the buildfarm reports results from TAP tests, as well as increased coverage, on Windows/MSVC machines.
I see vcregress is not processing the second argument passed to it. For example, "vcregress.bat check serial" runs the regress test in parallel mode.
Though this issue is present even before this patch is applied, am writing here because this patch touches the argument passing to sub-routine logic.
