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c9f4c45115
We had been relying on some extremely fragile code within dwarf2out in order to guess what to do with aligned stack frames, which broke when we decided to perform the stores to the aligned stack frame via EBP instead of ESP. Instead, emit the appropriate unwinding instructions from the backend. This requires adding a new reg-note in order to describe a register save at an arbitrary address. From-SVN: r162889
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