<rdar://problem/13443931>
Fixed a crasher in the SourceManager where it wasn't checking the m_target member variable for NULL.
In doing this fix, I hardened this class to have weak pointers to the debugger and target in case they do go away. I also changed SBSourceManager to hold onto weak pointers to the debugger and target so they don't keep objects alive by holding a strong reference to them.
git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177365 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed