Fix test case introduced in r214322

This patch adds an explicit triple to the test case introduced by r214322. This
should fix build failueres that are occuring on bots that are cross building.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214330 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/X86/x86-mixed-alignment-dagcombine.ll

@@ -1,4 +1,4 @@
-; RUN: llc  -mcpu=core2 -mattr=+64bit,+sse2 < %s | FileCheck %s
+; RUN: llc  -mtriple=x86_64-apple-macosx10.9.0  -mcpu=core2 -mattr=+64bit,+sse2 < %s | FileCheck %s
 
 ; DAGCombine may choose to rewrite 2 loads feeding a select as a select of
 ; addresses feeding a load. This test ensures that when it does that it creates