[m-dev.] for review: RL bugs

[Zoltan Somogyi]

> compiler/tree.m:
> 	Added `tree__tree_of_lists_is_empty', which is similar to
> 	`tree__is_empty' except that `node([])' is also considered empty.
> 	This is useful for trees of instructions.

Are there any cases where we actually want tree__is_empty to fail
when the only nodes in the tree contain nil? I can't think of any.
If I am right, we don't need a new predicate, just a fix to the old one.

Zoltan.
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