Move the SIMD intrinsic tests under coretests, and enable const-testing

Author: sayantn

library/coretests/tests/lib.rs

@@ -20,6 +20,7 @@
 #![feature(const_convert)]
 #![feature(const_destruct)]
 #![feature(const_eval_select)]
+#![feature(const_index)]
 #![feature(const_ops)]
 #![feature(const_option_ops)]
 #![feature(const_ref_cell)]
@@ -75,6 +76,7 @@
 #![feature(iterator_try_reduce)]
 #![feature(layout_for_ptr)]
 #![feature(lazy_get)]
+#![feature(macro_metavar_expr_concat)]
 #![feature(maybe_uninit_fill)]
 #![feature(maybe_uninit_uninit_array_transpose)]
 #![feature(maybe_uninit_write_slice)]
@@ -90,6 +92,7 @@
 #![feature(pointer_is_aligned_to)]
 #![feature(portable_simd)]
 #![feature(ptr_metadata)]
+#![feature(repr_simd)]
 #![feature(result_option_map_or_default)]
 #![feature(slice_from_ptr_range)]
 #![feature(slice_internals)]
@@ -191,6 +194,7 @@ mod pin_macro;
 mod ptr;
 mod result;
 mod simd;
+mod simd_intrinsics;
 mod slice;
 mod str;
 mod str_lossy;