Fix FileCheck --check-prefix lines.

Various tests had sprung up over the years which had --check-prefix=ABC on the
RUN line, but "CHECK-ABC:" later on. This happened to work before, but was
strictly incorrect. FileCheck is getting stricter soon though.

Patch by Ron Ofir.

llvm-svn: 188173
diff --git a/llvm/test/Transforms/InstCombine/fprintf-1.ll b/llvm/test/Transforms/InstCombine/fprintf-1.ll
index 1b7c104..3f6a314 100644
--- a/llvm/test/Transforms/InstCombine/fprintf-1.ll
+++ b/llvm/test/Transforms/InstCombine/fprintf-1.ll
@@ -1,7 +1,7 @@
 ; Test that the fprintf library call simplifier works correctly.
 ;
 ; RUN: opt < %s -instcombine -S | FileCheck %s
-; RUN: opt < %s -mtriple xcore-xmos-elf -instcombine -S | FileCheck %s -check-prefix=IPRINTF
+; RUN: opt < %s -mtriple xcore-xmos-elf -instcombine -S | FileCheck %s -check-prefix=CHECK-IPRINTF
 
 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"