[gcjx] Patch: FYI: fix virtual dispatch

[Tom Tromey]

Andrew> save_expr is kinda lame, and there has been talk that perhaps it
Andrew> shouldn't be used in new code.  Might it be better to use a temp?

Yeah, I forgot about that.  I put a note in the TODO file to do this.
It shouldn't be hard to just write a workalike wrapper that adds a
temporary variable; then we could s/save_expr/gcj_save_expr/
everywhere.

Tom