Testsuite cleaning

[Simon Peyton Jones]

Thomas
During debugging I often compile a single test program
            ghc -c T1969.hs
But the new testsuite setup doesn’t remove .hi and .o files before running a test, so
            make TEST=T1969
says

bytes allocated value is too low:

…

    Deviation   T1969(normal) bytes allocated:     -95.2 %
Reason?  Compilation was not required!
Non-perf tests fail in the same way

+compilation IS NOT required

*** unexpected failure for T11480b(normal)
I’m sure this didn’t use to happen.
It’s not fatal, because can manually remove those .o files, but it’s a bit of a nuisance.  Might it be easy to restore the old behaviour?
Thanks
Simon

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