fixes issue 317 + relax assert on NtFreeVirtualMemory failing since   no serious consequences
fixes issue 317
+ relax assert on NtFreeVirtualMemory failing since
  no serious consequences

git-svn-id: fe3cd4388a6e5a968b09397a3d721fe124e8117a@203 5b54908e-ead4-fc18-b48a-0285e6dbc711

rnk/drmemory,rnk/drmemory,rnk/drmemory,rnk/drmemory