Update testing case to use FileCheck instead of grep.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@188929 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/bitfield.c

-// RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o %t -O3
-// RUN: grep "ret i32" %t | count 4
-// RUN: grep "ret i32 1" %t | count 4
+// RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o - -O3 | FileCheck %s
 
 static int f0(int n) {
   struct s0 {
@@ -17,6 +15,8 @@ static int f0(int n) {
 }
 
 int g0(void) {
+// CHECK-LABEL: @g0()
+// CHECK: ret i32 1
   return f0(-1) + 44335655;
 }
 
@@ -35,6 +35,8 @@ static int f1(void) {
 }
 
 int g1(void) {
+// CHECK-LABEL: @g1()
+// CHECK: ret i32 1
   return f1() + 16;
 }
 
@@ -51,6 +53,8 @@ static int f2(void) {
 }
 
 int g2(void) {
+// CHECK-LABEL: @g2()
+// CHECK: ret i32 1
   return f2() - 9;
 }
 
@@ -70,5 +74,7 @@ static int f3(int n) {
 }
 
 int g3(void) {
+// CHECK-LABEL: @g3()
+// CHECK: ret i32 1
   return f3(20) + 130725747;
 }