[LLVM] Remove unwanted --check-prefix=CHECK from unit tests. NFC.

Summary: Removed unwanted --check-prefix=CHECK from numerous unit tests.

Reviewers: t.p.northover, dblaikie, uweigand, MatzeB, tstellarAMD, mcrosier

Subscribers: mcrosier, dsanders

Differential Revision: http://reviews.llvm.org/D19279

llvm-svn: 266834
diff --git a/llvm/test/CodeGen/SystemZ/atomicrmw-add-02.ll b/llvm/test/CodeGen/SystemZ/atomicrmw-add-02.ll
index cd4e478..13dbee8 100644
--- a/llvm/test/CodeGen/SystemZ/atomicrmw-add-02.ll
+++ b/llvm/test/CodeGen/SystemZ/atomicrmw-add-02.ll
@@ -1,6 +1,6 @@
 ; Test 16-bit atomic additions.
 ;
-; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT1
 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT2