Abstract out virtual calls and virtual function prologue code generation; implement them for -cxx-abi microsoft

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@188870 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index 393d96d..96b97bc 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -519,8 +519,13 @@
   CodeGenTypes &getTypes() { return Types; }
  
   CodeGenVTables &getVTables() { return VTables; }
+
   VTableContext &getVTableContext() { return VTables.getVTableContext(); }
 
+  MicrosoftVFTableContext &getVFTableContext() {
+    return VTables.getVFTableContext();
+  }
+
   llvm::MDNode *getTBAAInfo(QualType QTy);
   llvm::MDNode *getTBAAInfoForVTablePtr();
   llvm::MDNode *getTBAAStructInfo(QualType QTy);