[RFC]: Converting tree_opt_passes to use DEFPASS

[Daniel Berlin <dberlin at dberlin dot org>]

Before i do the other 41 of these, i'd like to make sure nobody is 
going to complain about it :)

This patch adds a tree-opt-pass.def (and tree-opt-pass.h that uses it) 
to generate our tree_opt_pass all from one file.
Since none of the internal fields are in the macro, this lets the 
underlying tree_opt_pass structure be changed without having to modify 
56 different files.

The only downside is that we have to make the gate and execute 
functions extern, rather than static.

I've not tried to do anything fancy with the macros (you could probably 
auto-generate time vars and dump names from the var name or something 
if we added a description field, for example) i just elided the 
internal-only fields from the macro.

Comments?
If nobody objects, i'll finish converting the other 41 tree_opt_pass 
structures to use this, and remove the extern structs from tree-pass.h

BTW, in case you want to see, the patch does bootstrap and regtest okay 
on powerpc-darwin, since it doesn't make it so you *can't* define 
tree_opt_pass structures outside of tree-opt-pass.def, it's just not 
going to be the preferred way anymore.
So I guess i could convert them incrementally if someone really wants.
--Dan

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