Fix expectation on gcc.dg/vect/pr71264.c

Fix expectation on gcc.dg/vect/pr71264.c

With the recent change to more reliably not vectorize code already
using vector types we run into FAILs of gcc.dg/vect/pr71264.c
The testcase was added for fixing an ICE and possible (re-)vectorization
of the code isn't really supported and I suspect might even go
wrong for non-bitops.

The following leaves the testcase as just testing for an ICE.

	PR tree-optimization/110544
	* gcc.dg/vect/pr71264.c: Remove scan for vectorization.