Add new files for IELR and canonical LR implementation.

* src/AnnotationList.c: New.
* src/AnnotationList.h: New.
* src/InadequacyList.c: New.
* src/InadequacyList.h: New.
* src/Sbitset.c: New.
* src/Sbitset.h: New.
* src/ielr.c: New.
* src/ielr.h: New.

src/ielr.h

@@ -0,0 +1,46 @@
+/* IELR main implementation.
+
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   This file is part of Bison, the GNU Compiler Compiler.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef IELR_H_
+# define IELR_H_
+
+#include <bitset.h>
+
+#include "state.h"
+
+/**
+ * \pre
+ *   - \c ::states is of size \c ::nstates and defines an LALR(1) parser for
+ *     the users's grammar.
+ *   - \c ::ntokens is the number of tokens in the grammar.
+ * \post
+ *   - \c ::states is of size \c ::nstates (which might be greater than
+ *     <tt>::nstates \@pre</tt>) and defines the type of parser specified by
+ *     the value of the \c \%define variable \c lr.type.  Its value can be:
+ *     - \c "LALR".
+ *     - \c "IELR".
+ *     - \c "canonical LR".
+ */
+void ielr (void);
+
+bool ielr_item_has_lookahead (state *s, symbol_number lhs, size_t item,
+                              symbol_number lookahead, state ***predecessors,
+                              bitset **item_lookahead_sets);
+
+#endif /* !IELR_H_ */