testsuite: Revert to the original version of pr100056.c

r15-268-g9dbff9c05520 restored the original GCC 11 output for
pr100056.c, so this patch reverts the changes made to the test
in r12-7259-g25332d2325c7.  (The code parts of r12-7259 still
seem useful, as a belt-and-braces thing.)

gcc/testsuite/
	* gcc.target/aarch64/pr100056.c: Restore the original version of
	the scan-assemblers.

gcc/testsuite/gcc.target/aarch64/pr100056.c

 /* PR target/100056 */
 /* { dg-do compile } */
 /* { dg-options "-O2" } */
-/* { dg-final { scan-assembler-not {\t[us]bfiz\tw[0-9]+, w[0-9]+, 11} { xfail *-*-* } } } */
-/* { dg-final { scan-assembler-times {\t[us]bfiz\tw[0-9]+, w[0-9]+, 11} 2 } } */
-/* { dg-final { scan-assembler-times {\tadd\tw[0-9]+, w[0-9]+, w[0-9]+, uxtb\n} 2 } } */
+/* { dg-final { scan-assembler-not {\t[us]bfiz\tw[0-9]+, w[0-9]+, 11} } } */
 
 int
 or_shift_u8 (unsigned char i)