Add new effective target: profile_update_atomic

	* g++.dg/gcov/gcov-threads-1.C: Use profile_update_atomic
	effective target.
	* gcc.dg/tree-prof/val-profiler-threads-1.c: Likewise.
	* lib/target-supports.exp: Define the new target.

From-SVN: r240111

gcc/testsuite/ChangeLog

+2016-09-13  Martin Liska  <mliska@suse.cz>
+
+	* g++.dg/gcov/gcov-threads-1.C: Use profile_update_atomic
+	effective target.
+	* gcc.dg/tree-prof/val-profiler-threads-1.c: Likewise.
+	* lib/target-supports.exp: Define the new target.
+
 2016-09-12  Andrew Pinski  <apinski@cavium.com>
 
 	* gcc.target/aarch64/thunderxloadpair.c: New testcase.

gcc/testsuite/g++.dg/gcov/gcov-threads-1.C

 /* { dg-options "-fprofile-arcs -ftest-coverage -pthread -fprofile-update=atomic" } */
 /* { dg-do run { target native } } */
+/* { dg-require-effective-target profile_update_atomic } */
 
 #include <stdint.h>
 #include <pthread.h>

gcc/testsuite/gcc.dg/tree-prof/val-profiler-threads-1.c

 /* { dg-options "-O0 -pthread -fprofile-update=atomic" } */
+/* { dg-require-effective-target profile_update_atomic } */
+
 #include <pthread.h>
 
 #define NUM_THREADS	8

gcc/testsuite/lib/target-supports.exp

@@ -7699,3 +7699,10 @@ proc check_effective_target_offload_hsa { } {
 	int main () {return 0;}
     } "-foffload=hsa" ]
 }
+
+# Return 1 if the target support -fprofile-update=atomic
+proc check_effective_target_profile_update_atomic {} {
+    return [check_no_compiler_messages profile_update_atomic assembly {
+	int main (void) { return 0; }
+    } "-fprofile-update=atomic -fprofile-generate"]
+}