Add vtable anchor to classes.

llvm-svn: 350142
diff --git a/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp b/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
index da972ea..724eced 100644
--- a/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
@@ -23,6 +23,8 @@
 
 using namespace llvm;
 
+void CallLowering::anchor() {}
+
 bool CallLowering::lowerCall(
     MachineIRBuilder &MIRBuilder, ImmutableCallSite CS, unsigned ResReg,
     ArrayRef<unsigned> ArgRegs, std::function<unsigned()> GetCalleeReg) const {
@@ -180,3 +182,5 @@
   }
   llvm_unreachable("unable to extend register");
 }
+
+void CallLowering::ValueHandler::anchor() {}