Fix crash when querying the CFG reported when using the thread safety analysis
on code using multi-dimensional arrays.  Fix by DeLesley Hutchins, and reported in
PR 12271.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153067 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed