[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/CodeGen/ARM/build-attributes-fn-attr0.ll b/llvm/test/CodeGen/ARM/build-attributes-fn-attr0.ll
index 2fb3e03..edb0bdd 100644
--- a/llvm/test/CodeGen/ARM/build-attributes-fn-attr0.ll
+++ b/llvm/test/CodeGen/ARM/build-attributes-fn-attr0.ll
@@ -5,7 +5,7 @@
 ; true when the compilation unit does not have any functions (i.e. the
 ; attributes are consistent), which is what we check with this regression test.
 
-; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mcpu=cortex-a15  | FileCheck %s --check-prefix=CHECK
+; RUN: llc < %s -mtriple=armv7-linux-gnueabi -mcpu=cortex-a15  | FileCheck %s
 
 ; CHECK:  .eabi_attribute 20, 2
 ; CHECK:  .eabi_attribute 21, 0