R600: Various fixes

[Vincent Lejeune]

Hi,

another serie with patches for various part of R600 backend.
The first 2 patches should fix some crash where ifcvt pass generate too big (> 128 inst long) alu clause.
The third one allows us to enable --verify-machineinstrs in some complex test. We couldn't do it before
because we did set wrong FrameSlot inst and did not set correct register class for some non allocatable reg
(KCache reg actually)
The 4th one set the "masked" flag to texture/export. It does not change anything currently but should be usefull
for a later patch that recompute instruction dependencies.

Vincent
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