Change testcase commandline to be more strict and silence buildbots

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139554 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/sse41-blend.ll b/test/CodeGen/X86/sse41-blend.ll
index ebbcdfa..5a169dc 100644
--- a/test/CodeGen/X86/sse41-blend.ll
+++ b/test/CodeGen/X86/sse41-blend.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -march=x86 -promote-elements -mattr=+sse41 | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7 -promote-elements -mattr=+sse41 | FileCheck %s
 
 ;CHECK: vsel_float
 ;CHECK: blendvps