[asan] relax the checks inside __sanitizer_annotate_contiguous_container: they are too optimistic due to https://code.google.com/p/address-sanitizer/issues/detail?id=258.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@199715 91177308-0d34-0410-b5e6-96231b3b80d8