Summary:
When in a gmodules-like debugging scenario, you can have a parent decl context
that gets imported from an external AST. When this happens, we must be careful
to complete this type before adding children to it, otherwise it sometimes
results in a crash.
Reviewers: clayborg, jingham
Subscribers: aprantl, JDevlieghere, lldb-commits
Differential Revision: https://reviews.llvm.org/D43592
llvm-svn: 327750
