Fix some cases were ArrayRefs were being passed by reference.

llvm-svn: 216527
diff --git a/clang/lib/AST/VTableBuilder.cpp b/clang/lib/AST/VTableBuilder.cpp
index c03fb32..3d29b5e 100644
--- a/clang/lib/AST/VTableBuilder.cpp
+++ b/clang/lib/AST/VTableBuilder.cpp
@@ -3129,7 +3129,7 @@
 }
 
 static bool setsIntersect(const llvm::SmallPtrSet<const CXXRecordDecl *, 4> &A,
-                          const ArrayRef<const CXXRecordDecl *> &B) {
+                          ArrayRef<const CXXRecordDecl *> B) {
   for (ArrayRef<const CXXRecordDecl *>::iterator I = B.begin(), E = B.end();
        I != E; ++I) {
     if (A.count(*I))