Revert "WORK IN PROGRESS: make KillHard less broken"

This reverts commit 9c9c474cdcacf2c82c52698049996a01dae2be3f.
Bug 926734: More specificity for which mappings might be libraries on B2G.

Note that we don't want this extra check on regular Android, because
there's Dalvik jitcode in ashmem, and any mappings that aren't that
special ashmem file will already be excluded (because everything else is
handled through dl_iterate_phdr).