[testsuite, ada] Convert ACATS to DejaGnu (PR testsuite/37703)

[Mike Stump]

On Feb 1, 2011, at 3:29 AM, Rainer Orth wrote:
> Fully agreed: we have a number of testcases with excessive resource
> requirements right now, either due to time consumption (both compile and
> run), or due to other issues (memory, stack size, ...).  One of the
> latest is gcc.c-torture/compile/pr46534.c which alone takes 9:16 min on
> a 1.6 GHz Core i7 (i386-pc-solaris2.11, both multilibs).
> 
> I'll probably instrument dg.exp to look out for tests taking more than
> 60 seconds.
> 
> Unfortunately, there's no guidance about what is considered appropriate
> and what out of bounds.

If you collect and display them with a plotting program (log scale maybe), it would become obvious where the right cutoff should be.  I'm thinking 3-10 seconds should be enough.