-ftree-check for review

[Sebastian Pop]

Hi,

Here is the patch that implements the tree-checker proposed by Nic
for performing user-defined checks on the tree/CFG form.
This patch just moves the code from the graphite-branch to trunk.
Bootstrapped and tested on i686-linux.  Okay for trunk?

For extra coverage of the tree-checker code, we can also activate,
when the compiler is bootstrapping with checking, custom checks
for va_end, as Zack suggested in
http://gcc.gnu.org/ml/gcc/2006-04/msg00062.html

Sebastian
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