gen_gc2 branch testing.

[Vasily Chekalkin]

Hello.

Before merging gen_gc2 branch into master we need to test it more.
Main focus of testing:

1. Different architectures with c and c++ compilers.
2. Optimized builds. Preferably with switched on GC validation. perl
Configure.pl
--optimize --ccflags="-DPARROT_GC_VALIDATE" will enable GC validation mode.
3. Build Rakudo/Lua/partcl-nqp on top of gen_gc2 branch.

I shaved few hairy yaks in last couple of days. But I suspect there is
more yaks to shave.

-- 
Bacek.