8133456: HeapRegionManager::shrink_by() iterates suboptimally across regions
Reviewed-by: brutisso, tbenson
os_family = solaris
arch = x86
arch_model = x86_32
os_arch = solaris_x86
os_arch_model = solaris_x86_32
lib_arch = i386
compiler = gcc
sysdefs = -DSOLARIS -D_GNU_SOURCE -DIA32