testsuite/99955 - fix may_alias declaration of vector

This fixes the order of the type attributes to preserve may_alias
for the vector type.

2021-04-07  Richard Biener  <rguenther@suse.de>

	PR testsuite/99955
	* gcc.c-torture/execute/pr92618.c: Move may_alias attributes
	last.

gcc/testsuite/gcc.c-torture/execute/pr92618.c

 /* PR tree-optimization/92618 */
 
-typedef long long __m128i __attribute__((__may_alias__, __vector_size__(2 * sizeof (long long))));
+typedef long long __m128i __attribute__((__vector_size__(2 * sizeof (long long)),__may_alias__));
 
 double a[4];
 unsigned long long b[4];
@@ -14,7 +14,7 @@ bar (void)
 }
 
 #if __SIZEOF_LONG_LONG__ == __SIZEOF_DOUBLE__
-typedef double __m128d __attribute__((__may_alias__, __vector_size__(2 * sizeof (double))));
+typedef double __m128d __attribute__((__vector_size__(2 * sizeof (double)),__may_alias__));
 
 __attribute__((noipa)) __m128i
 qux (void)