[testsuite] Add target pthread to pr86076.c

Add missing target pthread to ensure test doesn't fail on bare-metal
targets. Committed as obvious.

    testsuite/
	PR tree-optimization/86076
	* gcc.dg/pr86076.c: Add target pthread for bare-metal targets.

From-SVN: r261699

gcc/testsuite/ChangeLog

 2018-06-18  Wilco Dijkstra  <wdijkstr@arm.com>
 
+	PR tree-optimization/86076
+	* gcc.dg/pr86076.c: Add target pthread for bare-metal targets.
+
+2018-06-18  Wilco Dijkstra  <wdijkstr@arm.com>
+
 	PR tree-optimization/64946
 	* gcc.target/aarch64/vect-abs-compile.c: Remove xfail.
 

gcc/testsuite/gcc.dg/pr86076.c

-/* { dg-do compile } */
+/* { dg-do compile { target pthread } }  */
 /* { dg-options "-O2 -ftree-parallelize-loops=2 -fno-tree-dce -fno-tree-pre -fno-tree-vrp --param max-loop-header-insns=1" } */
 
 int __attribute__ ((noinline))