Correct types for op nqp::watchfile.

Previously this would complain about not being able to unbox a str to int.  Now
we at least get the NYI error.

Author: peschwa

src/vm/jvm/QAST/Compiler.nqp

@@ -2713,7 +2713,7 @@ QAST::OperationsJAST.map_classlib_core_op('queuepoll', $TYPE_OPS, 'queuepoll', [
 QAST::OperationsJAST.map_classlib_core_op('timer', $TYPE_OPS, 'timer', [$RT_OBJ, $RT_OBJ, $RT_INT, $RT_INT, $RT_OBJ], $RT_OBJ, :tc);
 QAST::OperationsJAST.map_classlib_core_op('cancel', $TYPE_OPS, 'cancel', [$RT_OBJ], $RT_OBJ, :tc);
 QAST::OperationsJAST.map_classlib_core_op('signal', $TYPE_IO_OPS, 'signal', [$RT_OBJ, $RT_OBJ, $RT_INT, $RT_INT, $RT_OBJ], $RT_OBJ, :tc);
-QAST::OperationsJAST.map_classlib_core_op('watchfile', $TYPE_IO_OPS, 'watchfile', [$RT_OBJ, $RT_OBJ, $RT_INT, $RT_OBJ], $RT_OBJ, :tc);
+QAST::OperationsJAST.map_classlib_core_op('watchfile', $TYPE_IO_OPS, 'watchfile', [$RT_OBJ, $RT_OBJ, $RT_STR, $RT_OBJ], $RT_OBJ, :tc);
 QAST::OperationsJAST.map_classlib_core_op('asyncconnect', $TYPE_IO_OPS, 'asyncconnect', [$RT_OBJ, $RT_OBJ, $RT_STR, $RT_INT, $RT_OBJ], $RT_OBJ, :tc);
 QAST::OperationsJAST.map_classlib_core_op('asynclisten', $TYPE_IO_OPS, 'asynclisten', [$RT_OBJ, $RT_OBJ, $RT_STR, $RT_INT, $RT_OBJ], $RT_OBJ, :tc);
 QAST::OperationsJAST.map_classlib_core_op('asyncwritestr', $TYPE_IO_OPS, 'asyncwritestr', [$RT_OBJ, $RT_OBJ, $RT_OBJ, $RT_STR, $RT_OBJ], $RT_OBJ, :tc);