Rewrite test/Integer tests to use FileCheck instead of grep

llvm-svn: 179047
diff --git a/llvm/test/Integer/packed_struct_bt.ll b/llvm/test/Integer/packed_struct_bt.ll
index 257c1c6..b8301ba 100644
--- a/llvm/test/Integer/packed_struct_bt.ll
+++ b/llvm/test/Integer/packed_struct_bt.ll
@@ -1,9 +1,9 @@
 ; RUN: llvm-as < %s | llvm-dis > %t1.ll
 ; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
 ; RUN: diff %t1.ll %t2.ll
-; RUN: not grep cast %t2.ll
-; RUN: grep "}>" %t2.ll
-; END.
+; RUN: FileCheck %s --input-file=%t2.ll
+; CHECK-NOT: cast
+; CHECK: }>
 
 %struct.anon = type <{ i8, i35, i35, i35 }>
 @foos = external global %struct.anon