This patch adds half a dozen new tests that test various edge cases in
the behaviour of the symbolizer and DWARF data parsing. All of them test
the current behaviour.
Reviewed by: JDevlieghere, aprantl
Differential Revision: https://reviews.llvm.org/D57741
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353286 91177308-0d34-0410-b5e6-96231b3b80d8