GTY or global_tree array?

[Tom Tromey]

I'm adding a new global tree to gcj.  I'd like to know whether it is
preferable to add a new slot to the java_global_trees array (along
with a new JTI_ constant and #define) or to just declare the new tree
as a global variable and mark it with GTY(()).

Is there some global style toward which we are aiming?
Is there a performance benefit to one or the other?

There is definitely a debugging advantage to the GTY route.  In case
of a tie, I'll probably let that decide.

Tom