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/lib/TableGen/TableGenBackend.cpp b/lib/TableGen/TableGenBackend.cpp
index 29588db..328d9a4 100644
--- a/lib/TableGen/TableGenBackend.cpp
+++ b/lib/TableGen/TableGenBackend.cpp
@@ -15,6 +15,8 @@
 #include "llvm/TableGen/Record.h"
 using namespace llvm;
 
+void TableGenBackend::anchor() { }
+
 void TableGenBackend::EmitSourceFileHeader(const std::string &Desc,
                                            raw_ostream &OS) const {
   OS << "//===- TableGen'erated file -------------------------------------*-"