[tree-ssa] COND_EXPR lowering.

[Chris Lattner]

> The goal is to flatten the COND_EXPR... to change the arms to be labels
> instead of stmt's changes the meaning of the COND_EXPR node to the rest
> of the compiler, so thats why Zdenek has chosen to leave them as GOTO's.

> How does that sound? I think it'll read cleaner too when looking at the
> code.

FWIW, we have been doing this in LLVM for several years now, and it works
great.  :)

-Chris

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