Revert "Enable intrinsification of System.Numerics types in corlib"

This reverts commit cf6aea0.

Author: UnityAlex

mono/mini/simd-intrinsics.c

@@ -2058,14 +2058,12 @@ mono_emit_simd_intrinsics (MonoCompile *cfg, MonoMethod *cmethod, MonoMethodSign
 	const char *class_name;
 	MonoInst *simd_inst = NULL;
 
-	if (mono_is_corlib_image (m_class_get_image (cmethod->klass)) ||
-	    is_sys_numerics_assembly (m_class_get_image (cmethod->klass)->assembly)) {
+	if (is_sys_numerics_assembly (m_class_get_image (cmethod->klass)->assembly)) {
 		simd_inst = emit_sys_numerics_intrinsics (cfg, cmethod, fsig, args);
 		goto on_exit;
 	}
 
-	if (mono_is_corlib_image (m_class_get_image (cmethod->klass)) ||
-	    is_sys_numerics_vectors_assembly (m_class_get_image (cmethod->klass)->assembly)) {
+	if (is_sys_numerics_vectors_assembly (m_class_get_image (cmethod->klass)->assembly)) {
 		simd_inst = emit_sys_numerics_vectors_intrinsics (cfg, cmethod, fsig, args);
 		goto on_exit;
 	}