My bet: GC allocating lots and lots of bitmaps :-/
Probably.
Here's the interesting question:
If these bitmaps live over compilation, and we know exactly when they die
(cgraph_reset_static_var_maps), why the heck are they gc allocated?
Ineed ;)
Also the current usage of these bitsmaps is disabled and Kenny already
has patch that reduce good amount of them when inlining takes place.
We probably need to decide what to do about mainline - either disable
collecting the information too or try harder to fix it.