[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

llvm-svn: 194865
diff --git a/llvm/lib/Target/R600/R600MachineFunctionInfo.cpp b/llvm/lib/Target/R600/R600MachineFunctionInfo.cpp
index 018b403..d0d35cf 100644
--- a/llvm/lib/Target/R600/R600MachineFunctionInfo.cpp
+++ b/llvm/lib/Target/R600/R600MachineFunctionInfo.cpp
@@ -12,7 +12,9 @@
 
 using namespace llvm;
 
+
+// pin vtable to this file
+void R600MachineFunctionInfo::anchor() {}
+
 R600MachineFunctionInfo::R600MachineFunctionInfo(const MachineFunction &MF)
   : AMDGPUMachineFunction(MF) { }
-
-