genrecog.c (make_insn_sequence): Correct position numbering when filtering out match_scratch and match_dup.

2011-07-20  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* genrecog.c (make_insn_sequence): Correct position numbering
	when filtering out match_scratch and match_dup.

From-SVN: r176518