[gimplefe] Merge from trunk, preparation for gimple testsuite

[Diego Novillo]

I've merged trunk into gimple-front-end (rev 187836).

I've added a manifest file to use with 
contrib/testsuite-management/validate_failures.py.

Sandeep, this will be useful when we start having more gimple tests (see 
http://gcc.gnu.org/wiki/Testing_GCC#Using_validate_failures.py).  You 
can use the validator to filter out all the "expected" FAIL/XPASS 
results from other parts of the testsuite.

I will be posting the patches to add the basic dejagnu support for 
having gimple tests.


Tested on x86_64.


Diego.