[PATCH 1/2] S/390: Disable 3 global-array-* tests for 31-bit mode

These tests rely on larl->movdi merge, which is not implemented for
31-bit mode.

gcc/testsuite/ChangeLog:

2018-11-14  Ilya Leoshkevich  <iii@linux.ibm.com>

	* gcc.target/s390/global-array-almost-huge-element.c: Run only
	in 64-bit mode.
	* gcc.target/s390/global-array-almost-negative-huge-element.c:
	Likewise.
	* gcc.target/s390/global-array-even-element.c: Likewise.

From-SVN: r266144

gcc/testsuite/ChangeLog

+2018-11-14  Ilya Leoshkevich  <iii@linux.ibm.com>
+
+	* gcc.target/s390/global-array-almost-huge-element.c: Run only
+	in 64-bit mode.
+	* gcc.target/s390/global-array-almost-negative-huge-element.c:
+	Likewise.
+	* gcc.target/s390/global-array-even-element.c: Likewise.
+
 2018-11-14  Wilco Dijkstra  <wdijkstr@arm.com>  
 	    Jackson Woodruff  <jackson.woodruff@arm.com>
 

gcc/testsuite/gcc.target/s390/global-array-almost-huge-element.c

 /* Test the maximum possible LARL offset.  */
-/* { dg-do compile } */
+/* { dg-do compile { target lp64 } } */
 /* { dg-options "-O1" } */
 
 extern char a[] __attribute__ ((aligned (2)));

gcc/testsuite/gcc.target/s390/global-array-almost-negative-huge-element.c

 /* Test the minimum LARL offset.  */
-/* { dg-do compile } */
+/* { dg-do compile { target lp64 } } */
 /* { dg-options "-O1" } */
 
 extern char a[] __attribute__ ((aligned (2)));

gcc/testsuite/gcc.target/s390/global-array-even-element.c

 /* Test accesses to even global array elements.  */
-/* { dg-do compile } */
+/* { dg-do compile { target lp64 } } */
 /* { dg-options "-O1" } */
 
 extern char a[] __attribute__ ((aligned (2)));