[testsuite, obvious] Remove explicit "dg-do run" from g++.dg/vect/pr87914.cc

[Sandra Loosemore]

I found another instance of PR testsuite/83889 in the g++ testsuite. 
I've committed the attached patch to fix it in the same way as all the 
others.

-Sandra
2019-09-14  Sandra Loosemore  <san...@codesourcery.com>
	PR testsuite/83889

	gcc/testsuite/
	* g++.dg/vect/pr87914.cc: Remove explicit dg-do run.
Index: gcc/testsuite/g++.dg/vect/pr87914.cc
===================================================================
--- gcc/testsuite/g++.dg/vect/pr87914.cc	(revision 275717)
+++ gcc/testsuite/g++.dg/vect/pr87914.cc	(working copy)
@@ -1,4 +1,3 @@
-// { dg-do run }
 // { dg-additional-options "-fopenmp-simd" }
 // { dg-additional-options "-mavx2" { target { avx2_runtime } } }