Merging r276956:
------------------------------------------------------------------------
r276956 | majnemer | 2016-07-27 22:03:22 -0700 (Wed, 27 Jul 2016) | 6 lines
[CodeView] Don't crash on functions without subprograms
A function may have instructions annotated with debug info without
having a subprogram.
This fixes PR28747.
------------------------------------------------------------------------
git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@277078
91177308-0d34-0410-b5e6-
96231b3b80d8