Move TableGen's parser and entry point into a library

This is the first step towards splitting LLVM and Clang's tblgen executables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140951 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/DisassemblerEmitter.h b/utils/TableGen/DisassemblerEmitter.h
index 7229d81..63ee552 100644
--- a/utils/TableGen/DisassemblerEmitter.h
+++ b/utils/TableGen/DisassemblerEmitter.h
@@ -10,7 +10,7 @@
 #ifndef DISASSEMBLEREMITTER_H
 #define DISASSEMBLEREMITTER_H
 
-#include "TableGenBackend.h"
+#include "llvm/TableGen/TableGenBackend.h"
 
 namespace llvm {