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Combine-4 fallout fix


HJ has verified that this patch fixes a testsuite failure on ia64.  The
problem occurs when computing the graph of which insn feeds which - we
use dead_or_set_p to determine whether i1 clobbers the register set by
i0, but that fails if i1 sets a ZERO_EXTRACT.  Using
reg_overlap_mentioned_p instead should solve it.

Bootstrapped and regression tested on i686-linux, ok?


Bernd

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