java: fix parser stack popping bug.

Reported at
<http://lists.gnu.org/archive/html/bug-bison/2011-02/msg00005.html>.
* THANKS (Angelo Borsotti): Add.
* data/lalr1.java (YYParser::YYStack::pop): Fix off-by-one error
in clearing the value stack.  Previously, the top element of the
stack wasn't cleared and so the value was not garbage collected.
(cherry picked from commit 6f75992be5)

Conflicts:

	data/lalr1.java

ChangeLog

@@ -1,3 +1,13 @@
+2011-03-06  Angelo Borsotti  <angelo.borsotti@gmail.com>  (tiny change)
+
+	java: fix parser stack popping bug.
+	Reported at
+	<http://lists.gnu.org/archive/html/bug-bison/2011-02/msg00005.html>.
+	* THANKS (Angelo Borsotti): Add.
+	* data/lalr1.java (YYParser::YYStack::pop): Fix off-by-one error
+	in clearing the value stack.  Previously, the top element of the
+	stack wasn't cleared and so the value was not garbage collected.
+
 2011-03-06  Joel E. Denny  <joeldenny@joeldenny.org>
 
 	doc: cite publication for LAC.

THANKS

@@ -8,6 +8,7 @@ Alexander Belopolsky      alexb@rentec.com
 Alexandre Duret-Lutz      adl@src.lip6.fr
 Andreas Schwab            schwab@suse.de
 Andrew Suffield           asuffield@users.sourceforge.net
+Angelo Borsotti           angelo.borsotti@gmail.com
 Anthony Heading           ajrh@ajrh.net
 Arnold Robbins            arnold@skeeve.com
 Art Haas                  ahaas@neosoft.com

data/lalr1.java

@@ -303,7 +303,7 @@ b4_lexer_if([[
     public final void pop (int num) {
       // Avoid memory leaks... garbage collection is a white lie!
       if (num > 0) {
-        java.util.Arrays.fill (valueStack, height - num + 1, height, null);
+        java.util.Arrays.fill (valueStack, height - num + 1, height + 1, null);
         ]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height, null);]])[
       }
       height -= num;