testsuite: Scan for SSE reg-reg moves only in pr80481.C

testsuite: Scan for SSE reg-reg moves only in pr80481.C

The function needs more than 8 SSE registers, avoid
false positives triggered by SSE spills for 32bit targets.

	* g++.dg/pr80481.C (dg-final): Scan for SSE reg-reg moves only.