These tests force dg-options because they rely on -ftree-vectorize and
do not make use of torture options, so move them to simd/ where they
belong.
gcc/testsuite/
* gcc.target/aarch64/advsimd-intrinsics/saturating_arithmetic_autovect.inc:
Move to gcc.target/aarch64/simd/.
* gcc.target/aarch64/advsimd-intrinsics/saturating_arithmetic_autovect_1.c: Likewise.
* gcc.target/aarch64/advsimd-intrinsics/saturating_arithmetic_autovect_2.c: Likewise.
* gcc.target/aarch64/advsimd-intrinsics/saturating_arithmetic_autovect_3.c: Likewise.
* gcc.target/aarch64/advsimd-intrinsics/saturating_arithmetic_autovect_4.c: Likewise.