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Basically we have a block which is marked as having threadable edges. However, due to other threading opportunities the block in question has become unreachable. We still attempt to thread the (non-existent) incoming edges, leading to the segfault. The fix is trivial. If a block has become unreachable, there's no sense in trying to thread through it. Attached is the patch for the GCC 4.0 branch which has been bootstrapped and regression tested on i686-pc-linux-gnu. I'll be testing the same patch for mainline overnight.
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