[CFARM] Script for automatic checking of patches

[Sebastian Pop]

Hi,

Here is a new version of the script that includes all the suggestions
from the current thread.

I must say that I'm quite unhappy with the output from compare_tests
as it is much too verbose with respect to the simpler result from
regression/btest-gcc.sh that reports the number of regressions and
fails, instead of printing too many useless comments and sometimes
inaccurate comparisons.  So I ended by keeping my adaptation of the
code from regression/btest-gcc.sh and I'm also calling compare_tests.

I've also written a script for preparing a patch for the patch tester
from a gcc tree.  Further comments and suggestions are welcome.  If no
comments, okay for trunk after some more testing on gcc's compile farm
;-) ?

Sebastian
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