add drheapstat postprocess.pl tests

_From [derek.br...@gmail.com](https://code.google.com/u/117968039472581148324/) on December 10, 2010 19:52:16_

PR 544262

xref PR 470723

we need at least one pre-commit test that ensures postprocess.pl as part of -visualize runs: else if we change postprocess.pl it is not exercised at all in the tests

while QA will construct more substantial tests of the data visualization,
we should have a basic test that not only postprocess runs but that
-visualize works. I suggest that in the linux tests we add a test that
launches flashplayer (have to decide whether to get it into toolchain or
what) and we have to eyeball it and say "looks ok" and then shut it down
and the tests continue. there are issues w/ the "load data" button,
unattended tests and timeouts, etc.

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=219_