Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146960 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Support/IRBuilderTest.cpp b/unittests/Support/IRBuilderTest.cpp
index 5d635ae..b15de9e 100644
--- a/unittests/Support/IRBuilderTest.cpp
+++ b/unittests/Support/IRBuilderTest.cpp
@@ -19,6 +19,7 @@
 
 using namespace llvm;
 
+namespace {
 class IRBuilderTest : public testing::Test {
 protected:
   virtual void SetUp() {
@@ -37,6 +38,7 @@
   OwningPtr<Module> M;
   BasicBlock *BB;
 };
+}
 
 TEST_F(IRBuilderTest, Lifetime) {
   IRBuilder<> Builder(BB);