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Seems to b working well enough to enable all the time.
Optimizations can be disabled with "export MESA_GLSL=nopt" if needed.
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This is a check-point commit; not turned on yet.
Use the linear scan register allocation algorithm to re-allocate temporary
registers. This is done by computing the live intervals for registers and
reallocating temps with that information.
For some shaders this dramatically reduces the number of temp registers
needed.
For the time being we give up on a few cases such as relative-indexed temps
and subroutine calls (but we inline most GLSL functions anyway).
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This is pretty simplistic for now, but helps with certain shaders.
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