increase bootimage.cpp heap and code size limits
increase bootimage.cpp heap and code size limits

OpenJDK is huge, so building a bootimage out of the whole thing (as
opposed to an app shrunk using ProGuard) requires a lot of space.
Note that we still can't handle this on ARM or PowerPC due to a
limitation in the compiler, but we don't expect people to ship
binaries with the entire OpenJDK class library anyway, so it shouldn't
be a problem in practice.

joshuawarner32/avian,ucdseniordesign/avian,MaartenR/avian,lwahlmeier/avian,joshuawarner32/avian,MaartenR/avian,marcinolawski/avian,minor-jason/avian,lwahlmeier/avian,bigfatbrowncat/avian-pack.avian,bgould/avian,MaartenR/avian,ucdseniordesign/avian,lostdj/avian,joshuawarner32/avian,MaartenR/avian,minor-jason/avian,minor-jason/avian,lwahlmeier/avian,bigfatbrowncat/avian-pack.avian,marcinolawski/avian,dicej/avian,lostdj/avian,minor-jason/avian,lwahlmeier/avian,getlantern/avian,lostdj/avian,dicej/avian,bigfatbrowncat/avian-pack.avian,ucdseniordesign/avian,bgould/avian,dicej/avian,getlantern/avian,bigfatbrowncat/avian-pack.avian,joshuawarner32/avian,marcinolawski/avian,lostdj/avian,getlantern/avian,bgould/avian,dicej/avian,getlantern/avian,bgould/avian,ucdseniordesign/avian,marcinolawski/avian