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make if-conversion and archdep optimisations get their information directly from the backend without frontends needing special code to transfer these infos

[r27937]

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[r27924]

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[r27913]

sparc: No need for Minus, Not, Nop nodes. Implement with the real instructions Sub, XNor and zero register

[r27912]

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[r27900]

The gain from using an extra Unreachable is rather low, plus the noreturn call must probably be keeped anyway, so revrt it again

[r27898]

Unreachable nodes mark unreachable control flow (after noreturn calls). They
"eat" the memory, saving the two keeps used before.

Works mostly yet (scheduler issues warning about not scheduled Unreachable's)

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[r27875]