[weak vtables] Remove a bunch of weak vtables

This patch removes most of the trivial cases of weak vtables by pinning them to
a single object file.

Differential Revision: http://llvm-reviews.chandlerc.com/D2068

Reviewed by Andy

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194865 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocBase.cpp b/lib/CodeGen/RegAllocBase.cpp
index b94ce4d..3a4d546 100644
--- a/lib/CodeGen/RegAllocBase.cpp
+++ b/lib/CodeGen/RegAllocBase.cpp
@@ -50,6 +50,9 @@
 //                         RegAllocBase Implementation
 //===----------------------------------------------------------------------===//
 
+// pin vtable to this file
+void RegAllocBase::anchor() {}
+
 void RegAllocBase::init(VirtRegMap &vrm,
                         LiveIntervals &lis,
                         LiveRegMatrix &mat) {