tests/parser/crash2.i: assertion failure crash added
bison/lalr1.java: BUGFIX: yylen wasn't cleared after yyaction()

The translation from the C parser missed a tiny detail: yylen is
passed to yyaction() as a parameter, so clearing it inside yyaction()
has no effect.

So, we move the clearing outside.
bison: add a patch file for the yylen fix