[llvm] Remove redundant --check-prefix=CHECK from tests

Reviewers: MatzeB, mcrosier, rengolin

Differential Revision: https://reviews.llvm.org/D25894

llvm-svn: 285003
diff --git a/llvm/test/Transforms/SimplifyCFG/ARM/switch-to-lookup-table-constant-expr.ll b/llvm/test/Transforms/SimplifyCFG/ARM/switch-to-lookup-table-constant-expr.ll
index 25c4987..453a768 100644
--- a/llvm/test/Transforms/SimplifyCFG/ARM/switch-to-lookup-table-constant-expr.ll
+++ b/llvm/test/Transforms/SimplifyCFG/ARM/switch-to-lookup-table-constant-expr.ll
@@ -1,4 +1,4 @@
-; RUN: opt -S -simplifycfg < %s | FileCheck %s --check-prefix=CHECK
+; RUN: opt -S -simplifycfg < %s | FileCheck %s
 
 target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
 target triple = "armv7a--none-eabi"