Eliminate struct TableGenBackend.

TableGen backends are simply written as functions now.

Patch by Sean Silva!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158389 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/TableGen/TableGenBackend.cpp b/lib/TableGen/TableGenBackend.cpp
index 8117250..89d3f5e 100644
--- a/lib/TableGen/TableGenBackend.cpp
+++ b/lib/TableGen/TableGenBackend.cpp
@@ -1,4 +1,4 @@
-//===- TableGenBackend.cpp - Base class for TableGen Backends ---*- C++ -*-===//
+//===- TableGenBackend.cpp - Utilities for TableGen Backends ----*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -11,17 +11,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/TableGen/TableGenBackend.h"
-#include "llvm/TableGen/Record.h"
 using namespace llvm;
 
-void TableGenBackend::anchor() { }
-
-void TableGenBackend::EmitSourceFileHeader(StringRef Desc,
-                                           raw_ostream &OS) const {
-  emitSourceFileHeader(Desc, OS);
-}
-
 void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
   OS << "//===- TableGen'erated file -------------------------------------*-"
        " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"