RFC: ggc-boehm, proof of concept

[Laurynas Biveinis]

> For C files, you can use combine, reload, reload1, insn-attrtab,
> insn-recog.  For C++ you can use tramp3d (I don't remember off hand
> where to get it, ask Richard Guenther) and PR8361.

Thanks for the input, I tried to summarize it at
http://gcc.gnu.org/wiki/GCPerformanceTests - might be useful for other
performance projects too.

-- 
Laurynas