buildbot/valgrind: Suppress warnings about leaks in /bin/grep.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111528 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/valgrind/x86_64-pc-linux-gnu.supp b/utils/valgrind/x86_64-pc-linux-gnu.supp
index 0cbb332..835cbbe 100644
--- a/utils/valgrind/x86_64-pc-linux-gnu.supp
+++ b/utils/valgrind/x86_64-pc-linux-gnu.supp
@@ -28,6 +28,12 @@
 }
 
 {
+   We don't care if grep leaks
+   Memcheck:Leak
+   obj:/bin/grep
+}
+
+{
    We don't care if python leaks
    Memcheck:Leak
    fun:malloc