IR: Appease MSVC after r280107 with an & or two

Fixes the bot:
http://lab.llvm.org:8011/builders/clang-x64-ninja-win7/builds/15192

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280116 91177308-0d34-0410-b5e6-96231b3b80d8

Author: dexonsmith

unittests/IR/ModuleTest.cpp

@@ -25,7 +25,7 @@ bool sortByNameReverse(const GlobalVariable &L, const GlobalVariable &R) {
 
 TEST(ModuleTest, sortGlobalsByName) {
   LLVMContext Context;
-  for (auto compare : {sortByName, sortByNameReverse}) {
+  for (auto compare : {&sortByName, &sortByNameReverse}) {
     Module M("M", Context);
     Type *T = Type::getInt8Ty(Context);
     GlobalValue::LinkageTypes L = GlobalValue::ExternalLinkage;