Fixing a whole class of crashers and potential crashers related to data formatters eating up all the stack when an unknown class has to be summarized ; this should make the whole Objective-C summaries more stable

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@153712 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed