testsuite: Fix up vect-simd-clone-1[678]f.c tests some more

testsuite: Fix up vect-simd-clone-1[678]f.c tests some more

With
make check-gcc check-g++ -j32 -k RUNTESTFLAGS='--target_board=unix\{-m32,-m32/-mavx,-m32/-mavx512f,-m32/-march=cascadelake,-m64,-m64/-mavx,-m64/-mavx512f,-m64/-march=cascadelake\}
+vect.exp=vect-simd-clone*'
the vect-simd-clone-1[678]f.c tests fail with -m32/-mavx512f and -m32/-march=cascadelake,
in that case there are zero matches rather than the 4 expected for ia32.
-m64/-mavx512f and -m64/-march=cascadelake works fine though (2 expected
matches).

So, the following patch just adds -mno-avx512f for x86 non-lp64.

2023-04-17  Jakub Jelinek  <jakub@redhat.com>

	* gcc.dg/vect/vect-simd-clone-16f.c: Add -mno-avx512f for non-lp64 x86.
	* gcc.dg/vect/vect-simd-clone-17f.c: Likewise.
	* gcc.dg/vect/vect-simd-clone-18f.c: Likewise.