testsuite: Fix up tree-ssa/pr92706-1.c on 32-bit targets.

The test uses __int128_t, so won't work on targets that don't support it.

2020-01-30  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/92706
	* gcc.dg/tree-ssa/pr92706-1.c: Require int128 effective target.

gcc/testsuite/ChangeLog

+2020-01-30  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/92706
+	* gcc.dg/tree-ssa/pr92706-1.c: Require int128 effective target.
+
 2020-01-29  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/88092

gcc/testsuite/gcc.dg/tree-ssa/pr92706-1.c

-/* { dg-do compile } */
+/* { dg-do compile { target int128 } } */
 /* { dg-options "-O2 -fdump-tree-esra-details" } */
 
 struct S { int i[4]; } __attribute__((aligned(128)));