Fold more shuffle builtins to VEC_PERM_EXPR.

Fold more shuffle builtins to VEC_PERM_EXPR.

A follow-up to https://gcc.gnu.org/pipermail/gcc-patches/2019-May/521983.html

gcc/
	PR target/98167
	PR target/43147
	* config/i386/i386.c (ix86_gimple_fold_builtin): Fold
	IX86_BUILTIN_SHUFPD512, IX86_BUILTIN_SHUFPS512,
	IX86_BUILTIN_SHUFPD256， IX86_BUILTIN_SHUFPS，
	IX86_BUILTIN_SHUFPS256.
	(ix86_masked_all_ones): New function.

gcc/testsuite/
	* gcc.target/i386/avx512f-vshufpd-1.c: Adjust testcase.
	* gcc.target/i386/avx512f-vshufps-1.c: Adjust testcase.
	* gcc.target/i386/pr43147.c: New test.