maintaining all_memory_areas requires watching SYS_brk

From [email protected] on March 20, 2009 15:34:29

the new all_memory_areas_list, aside from getting off due to the kernel merging regions, is not watching SYS_brk, which we didn't need to watch before when querying /proc/maps

xref PR 213256(8821): [linux] all_memory_areas list and /proc/maps don't agree on protection bits (merging, etc.) xref PR 246897: dr_query_memory() uses from_os()

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=91