* tree-eh.c (tree_remove_unreachable_handlers): Handle shared labels.

	(tree_empty_eh_handler_p): Allow non-EH predecestors; allow region
	to be reached by different label than left.
	(update_eh_edges): Update comment; remove edge_to_remove if possible
	and return true if suceeded.
	(cleanup_empty_eh): Accept sharing map; handle shared regions.
	(cleanup_eh): Compute sharing map.
	* except.c (remove_eh_handler_and_replace): Add argument if we should
	update regions.
	(remove_unreachable_regions): Update for label sharing.
	(label_to_region_map): Likewise.
	(get_next_region_sharing_label): New function.
	(remove_eh_handler_and_replace): Add update_catch_try parameter; update
	prev_try pointers.
	(remove_eh_handler): Update.
	(remove_eh_region_and_replace_by_outer_of): New function.
	* except.h (struct eh_region): Add next_region_sharing_label.
	(remove_eh_region_and_replace_by_outer_of,
	get_next_region_sharing_label): Declare.
	* tree-cfgcleanup.c (tree_forwarder_block_p): Simplify.

	* tree-cfg.c (split_critical_edges): Split also edges where we can't
	insert code even if they are not critical.

	* tree-cfg.c (gimple_can_merge_blocks_p): EH edges are unmergable.
	(gimple_can_remove_branch_p): EH edges won't remove branch by
	redirection.
	* tree-inline.c (update_ssa_across_abnormal_edges): Do handle
	updating of non-abnormal EH edges.
	* tree-cfg.c (gimple_can_merge_blocks_p): EH edges are unmergable.
	(gimple_can_remove_branch_p): EH edges are unremovable by redirection.
	(split_critical_edges): Split also edges where emitting code on them
	will lead to splitting later.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@146763 138bc75d-0d04-0410-961f-82ee72b054a4

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