IcedTea 6 & 7 don’t garbage collect with Fedora 22

[Stefan Ring]

I’m just throwing this over the wall, as I’m not expecting great
interest in the old stuff. I just noticed that when I rebuilt icedtea
6 and 7 yesterday, after just having upgraded to Fedora 22, the first
invocation of the newly built JVM resulted in all memory consumed and
heavy swapping. I used the latest released versions of the respective
branches without any fancy options (HotSpot build).

I tend to blame the new gcc, but have not verified this.