Greg Clayton ec6829eac0 Patch from Todd Fiala: lldb will seg fault if for some reason there is no unwinder when StackFrameList::GetFramesUpTo() is called.
Mainly patched to stop LLDB from crashing. This can easily happen if you debug to a remote gdbserver that doesn't have any dynamic register info and you don't have a target definition file specified.

llvm-svn: 195499
2013-11-22 21:03:42 +00:00
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