R600: Various Fixes

[Vincent Lejeune]

Hi,

This patches serie fixes some bugs uncovered by running some webgl samples.

Patches 1, 3, 4 fix 2 bugs in the VectorMerger pass.
Patch 2 makes fcos/fsin works for all values, and not only the one between -Pi and Pi.
Last patch rework the predication we're doing by taking clause marker into account.
Currently we loose some predicate opportunities (all machine block with Kcache constant
becomes unpredicable atm, this can be solved later but need the isPredicableFunction to accept
an extra argument) but the pass output should be correct in most situations.


Vincent
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