re PR rtl-optimization/34171 (Segfault in df_chain_remove_problem with -O3 on alpha)

re PR rtl-optimization/34171 (Segfault in df_chain_remove_problem with -O3 on alpha)

gcc/testsuite/ChangeLog:

2007-11-30  Martin Michlmayr <tbm@cyrius.com>

	PR rtl-optimization/34171
	* gcc.dg/pr34171.c: New testcase.

gcc/ChangeLog:

2007-11-30  Seongbae Park <seongbae.park@gmail.com>

	PR rtl-optimization/34171
	* cfgrtl.c (update_bb_for_insn_chain): New function,
	refactored from update_bb_for_insn.
	(update_bb_for_insn): Call update_bb_for_insn.
	(rtl_merge_blocks, try_redirect_by_replacing_jump):
	Replace a loop with update_bb_for_insn_chain call.
	(cfg_layout_merge_blocks): Add a call to
	update_bb_for_insn_chain. Replace the for loop
	with a call to update_bb_for_insn_chain.

From-SVN: r130539