Replace 'grep foo | count 0' with 'not grep foo'.

This avoids depending on pipefail not being used.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@185648 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/bitfield-assign.c b/test/CodeGen/bitfield-assign.c
index b8ab613..058f5ed 100644
--- a/test/CodeGen/bitfield-assign.c
+++ b/test/CodeGen/bitfield-assign.c
@@ -10,8 +10,8 @@
 
 // Check that we got the right value.
 // RUN: %clang_cc1 -triple i386-unknown-unknown -O3 -emit-llvm -o %t %s
-// RUN: grep 'load ' %t | count 0
-// RUN: grep "@g0" %t | count 0
+// RUN: not grep 'load ' %t
+// RUN: not grep "@g0" %t
 
 struct s0 {
   int f0 : 2;