[tree-ssa] Gimplifying Java

[law@redhat.com]

In message <1055378824.824.129.camel@frodo.toronto.redhat.com>, Diego Novillo w
rites:
 >> Most of the conversion is handled in java_simplify_expr, however there are
 >> other changes due to certain trees that are not acceptable to gimplify
 >> even though they are accepted by the RTL expanders.  For example,
 >> LOOP_EXPR nodes with trailing empty statements cause an incorrect CFG to
 >> be constructed, breaking copy/constant propogation.
 >>
 >Do you have a test case for this?  It sounds vaguely familiar.
No need.  See my previous message.   I'm working on this since it's blocking
our ability to do things like zap calls to useless const functions.

jeff