[ARM] Make sure we do not dereference the end iterator when accessing debug
information.
Although the problem was always here, it would only be exposed when
shrink-wrapping is enable.

rdar://problem/23110493


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@250352 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed