Fix tsan race_on_mutex.c testcase (PR80551)

The testcase did not match the glibc internal names while it should.
This fixes it.


gcc/testsuite/
	PR testsuite/80551
	* c-c++-common/tsan/race_on_mutex.c: Change regexp to allow
	__GI___pthread_mutex_init as well.

From-SVN: r257932

gcc/testsuite/ChangeLog

+2018-02-23  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR testsuite/80551
+	* c-c++-common/tsan/race_on_mutex.c: Change regexp to allow
+	__GI___pthread_mutex_init as well.
+
 2018-02-23  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/83148

gcc/testsuite/c-c++-common/tsan/race_on_mutex.c

@@ -42,5 +42,5 @@ int main() {
 /* { dg-output "    #1 Thread2.* .*(race_on_mutex.c:22|\\?{2}:0) (.*)" } */
 /* { dg-output "  Previous write of size \[0-9]\+ at .* by thread T1:(\n|\r\n|\r)" } */
 /* { dg-output "(    #0 \[^\n\r\]*(\n|\r\n|\r))?" } */
-/* { dg-output "    #\[01\] (__)?pthread_mutex_init \[^\n\r\]* (.)*" } */
+/* { dg-output "    #\[01\] ((__GI_)?__)?pthread_mutex_init \[^\n\r\]* (.)*" } */
 /* { dg-output "    #\[12\] Thread1.* .*(race_on_mutex.c:12|\\?{2}:0) .*" } */