tree-flow-inline.h (get_subvar_at): Use binary search.

tree-flow-inline.h (get_subvar_at): Use binary search.

2007-10-29  Richard Guenther  <rguenther@suse.de>

	* tree-flow-inline.h (get_subvar_at): Use binary search.
	(get_first_overlapping_subvar): New function to binary search
	for the first overlapping subvar.
	* tree-ssa-operands.c (add_vars_for_offset): Strip down to
	just handle adding subvars for a pointed-to subvar.  Optimize
	and use get_first_overlapping_subvar.
	(add_vars_for_bitmap): Fold into single caller.
	(add_virtual_operand): Streamline, inherit add_vars_for_bitmap
	and non pointed-to bits of add_vars_for_offset.

From-SVN: r129727