Questions on tree-inline.c

[Richard Kenner]

    This was discussed at length.  The problem with putting all this in
    the java/ directory is that a great deal of logic would have been
    duplicated and we would require two files to be updated each time a
    change to the inliner was made.

But I thought that's what the language hooks are for?  If not, then what
*are* they for?

And why do we have two tree nodes that are essentially the same except
for the name (like GOTO_EXPR and GOTO_STMT, RETURN_EXPR and RETURN_STMT, etc)?