[tuples] Conversion of estimate_num_insns and pass_ch

[Diego Novillo]

This patch merges the patches from Zdenek and Bill to convert
estimate_num_insns and pass_ch.  Note that I still wasn't able to
re-enable pass_ch, as libgcc does not build because of unconverted
code.

We are still missing some of the CFG manipulators and VRP.  I
re-enabled ssa_name_nonzero_p and ssa_name_nonnegative_p to always
return false, and I also re-enabled split_block for gimple, but that's
not enough.

Since we need estimate_num_insns for other stuff, I think it's best to
commit this and re-enable pass_ch later.  Zdenek, I think we are only
missing a few bits, so it shouldn't be much of a problem.


Thanks.  Diego.
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