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/CodeGen/LexicalScopes.cpp b/lib/CodeGen/LexicalScopes.cpp
index a12e1a3..f1abcbb 100644
--- a/lib/CodeGen/LexicalScopes.cpp
+++ b/lib/CodeGen/LexicalScopes.cpp
@@ -311,6 +311,8 @@
   return Result;
 }
 
+void LexicalScope::anchor() { }
+
 /// dump - Print data structures.
 void LexicalScope::dump() const {
 #ifndef NDEBUG