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

lib/DebugInfo/DWARFContext.h

@@ -86,6 +86,7 @@ public:
 /// DWARFContext. It assumes all content is available in memory and stores
 /// pointers to it.
 class DWARFContextInMemory : public DWARFContext {
+  virtual void anchor();
   StringRef InfoSection;
   StringRef AbbrevSection;
   StringRef ARangeSection;