[libgomp, testsuite, openacc] Remove -foffload=-w in reduction-[1-5].c

Before the commit "[libgomp, testsuite, openacc] Don't use const int for
dimensions", the "const int" construct was used to set launch dimensions in
reductions-[1-5].c.  In the case of -xc -O0, the const int is implemented as a
variable by the C front-end.  Consequently, the nvptx back-end generated
warnings that vector_length was overridden to be hard-coded, rather than left to
be set at runtime.  The test-cases silenced these warnings by switching off all
warnings in the accelerator compiler using "-foffload=-w".

Given that no warnings occur anymore, remove the "-foffload=-w" setting.

2019-01-11  Tom de Vries  <tdevries@suse.de>

	* testsuite/libgomp.oacc-c-c++-common/reduction-1.c: Remove
	-foffload=-w.
	* testsuite/libgomp.oacc-c-c++-common/reduction-2.c: Same.
	* testsuite/libgomp.oacc-c-c++-common/reduction-3.c: Same.
	* testsuite/libgomp.oacc-c-c++-common/reduction-4.c: Same.
	* testsuite/libgomp.oacc-c-c++-common/reduction-5.c: Same.

From-SVN: r267836

libgomp/ChangeLog

 2019-01-11  Tom de Vries  <tdevries@suse.de>
 
+	* testsuite/libgomp.oacc-c-c++-common/reduction-1.c: Remove
+	-foffload=-w.
+	* testsuite/libgomp.oacc-c-c++-common/reduction-2.c: Same.
+	* testsuite/libgomp.oacc-c-c++-common/reduction-3.c: Same.
+	* testsuite/libgomp.oacc-c-c++-common/reduction-4.c: Same.
+	* testsuite/libgomp.oacc-c-c++-common/reduction-5.c: Same.
+
+2019-01-11  Tom de Vries  <tdevries@suse.de>
+
 	* testsuite/libgomp.oacc-c-c++-common/insufficient-resources.c: New
 	test.
 

libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-1.c

 /* { dg-do run } */
 
-/* Ignore vector_length warnings for offloaded (nvptx) targets.  */
-/* { dg-additional-options "-foffload=-w" } */
-
 /* Integer reductions.  */
 
 #include <stdlib.h>

libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-2.c

 /* { dg-do run } */
 
-/* Ignore vector_length warnings for offloaded (nvptx) targets.  */
-/* { dg-additional-options "-foffload=-w" } */
-
 /* float reductions.  */
 
 #include <stdlib.h>

libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-3.c

 /* { dg-do run } */
 
-/* Ignore vector_length warnings for offloaded (nvptx) targets.  */
-/* { dg-additional-options "-foffload=-w" } */
-
 /* double reductions.  */
 
 #include <stdlib.h>

libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-4.c

 /* { dg-do run { target { ! { hppa*-*-hpux* } } } } */
 
-/* Ignore vector_length warnings for offloaded (nvptx) targets.  */
-/* { dg-additional-options "-foffload=-w" } */
-
 /* complex reductions.  */
 
 #include <stdlib.h>

libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-5.c

 /* { dg-do run } */
 /* { dg-additional-options "-w" } */
 
-/* Ignore vector_length warnings for offloaded (nvptx) targets.  */
-/* { dg-additional-options "-foffload=-w" } */
-
 /* Multiple reductions.  */
 
 #include <stdio.h>