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4c781fd78a
Modify UnwindLLDB::SearchForSavedLocationForRegister so if the register save locations for a register mid-stack is in another register (or in the same register, indicating the reg wasn't modified in this frame), don't return that as a found location. Keep iterating down the array of frames until a concrete location/value for the register is found, or until we get to frame 0 where the reg value can be used as-is. If lldb was trying to backtrace a program that blew out its stack via recursion and the unwind instructions had some kind of this-reg-is-saved-in-that-reg instruction, lldb would revert to doing a recursive search for a concrete value and blow out its own stack. llvm-svn: 172887