[AArch64] Update expected output for sve/var_stride_[24].c

[AArch64] Update expected output for sve/var_stride_[24].c

After Segher's recent combine change, these tests now use a single
instruction to do the "and" and "lsl 10".  This is a good thing,
so the patch updates the expected output accordingly.

2018-08-01  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/
	* gcc.target/aarch64/sve/var_stride_2.c: Update expected form
	of range check.
	* gcc.target/aarch64/sve/var_stride_4.c: Likewise.

From-SVN: r263228