Java: Miranda methods fix - PR 12254

[Bryce McKinlay]

Miranda methods are those defined in an interface and implemented by an 
abstract class that does not explicitly redeclare or define them. A 
recent patch fixed/improved the way these "miranda methods" are 
implemented in GCJ, however it caused a problem which broke libgcj's 
networking code:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12254

The problem seems to be that the order in which methods in an interface 
are seen by add_miranda_methods is dependent on whether that interface 
has previously been "laid out" by layout_class_methods - order matters 
for the current Java ABI. The solution is to call layout_class_methods 
explicitly on super-interfaces prior to checking them for miranda 
methods.

This patch also modifies make_class_data so miranda methods are not 
included in abstract classes reflection data.

OK to commit?

Bryce.

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