re PR target/9786 (Ice in fixup_abnormal_edges with -fnon-call-exceptions -O2)

re PR target/9786 (Ice in fixup_abnormal_edges with -fnon-call-exceptions -O2)

	PR target/9786
	* reg-stack.c (convert_regs_1): Purge possible dead eh edges
	after potential deletion of trapping insn. Avoids later ICE
	from call to fixup_abnormal_edges.
	(convert_regs_2): Stack the current block successors before
	processing this block, that is, before the potential deletion of
	dead edges by convert_regs_1, because these edges have been used
	to initialize the predecessors count.

From-SVN: r71644