Add basic covariant thunk generation support.  WIP.

llvm-svn: 81585
diff --git a/clang/lib/CodeGen/Mangle.h b/clang/lib/CodeGen/Mangle.h
index 16f1ae6..91143a5 100644
--- a/clang/lib/CodeGen/Mangle.h
+++ b/clang/lib/CodeGen/Mangle.h
@@ -37,10 +37,9 @@
                   llvm::raw_ostream &os);
   void mangleThunk(const FunctionDecl *FD, int64_t n, int64_t vn,
                    ASTContext &Context, llvm::raw_ostream &os);
-  void mangleCovariantThunk(const NamedDecl *D, bool VirtualThis, int64_t nv_t,
-                          int64_t v_t, bool VirtualResult, int64_t nv_r,
-                          int64_t v_r, ASTContext &Context,
-                          llvm::raw_ostream &os);
+  void mangleCovariantThunk(const FunctionDecl *FD, int64_t nv_t, int64_t v_t,
+                            int64_t nv_r, int64_t v_r, ASTContext &Context,
+                            llvm::raw_ostream &os);
   void mangleGuardVariable(const VarDecl *D, ASTContext &Context,
                            llvm::raw_ostream &os);
   void mangleCXXVtable(QualType T, ASTContext &Context, llvm::raw_ostream &os);