[tree-ssa] Java: convert byte compiler to functions-as-trees

[Andrew Haley]

Once we do this, we can beging to do tree optimizations in the byte
compiler.  Such optimizations include inlining a bytecode method in
a source compiled method.

This is done by directly generating tree nodes while processing
bytecode input, rather than calling expand_foo() for each statement.
Mostly the changes are pretty obvious, but exception handling is done
in a totally different way.  Unlike the source compiler, the bytecode
compiler generates BIND_EXPRs directly, which somewhat simplifies the
handling of debug information.

This isn't the end of the story, because there is still a fair bit of
cruft that I haven't removed.

As I mentioned earlier, this patch does cause a few failures in the
tree optimizers.  I don't know where the bug lies; maybe in the front
end, maybe in the tree optimizers.

Andrew.

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