i#1708 early inject failing: update comment about ASLR
i#1708 early inject failing: update comment about ASLR

Updates the incorrect comment about ASLR during early injection, including
with a FIXME about the latest kernel changes breaking our approach
altogether.

Review-URL: https://codereview.appspot.com/243410044

bl4ckic3/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,daksunt/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,daksunt/dynamorio