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

llvm-svn: 146960
diff --git a/llvm/lib/Object/Archive.cpp b/llvm/lib/Object/Archive.cpp
index 8bdab16..ad1cde0 100644
--- a/llvm/lib/Object/Archive.cpp
+++ b/llvm/lib/Object/Archive.cpp
@@ -74,6 +74,8 @@
   return false;
 }
 
+void Archive::anchor() { }
+
 Archive::Child Archive::Child::getNext() const {
   size_t SpaceToSkip = sizeof(ArchiveMemberHeader) +
     ToHeader(Data.data())->getSize();