i965: Make try_rewrite_rhs_to_dst compare VGRF size to regs written.

i965: Make try_rewrite_rhs_to_dst compare VGRF size to regs written.

try_rewrite_rhs_to_dst is a quick optimization to avoid generating new
temporaries (and MOVs from those temporaries to the dest) for every
expression tree we visit.  By generating better code in simple cases, we
reduce the burden on later optimization passes like register coalescing.

Previously, we compared inst->regs_written() to lhs->vector_elements
to make sure the instruction generating our value wrote the same number
of components as our destination register.

However, this fails in some cases.  One example is texturing (which
produces a vec4) into gl_FragData[i].  Technically, gl_FragData[i] is
also a vec4.  However, the destination VGRF actually has size 4n (where
n is the size of the array).

split_virtual_grfs() can't split VGRFs that are used by SEND messages
which require contiguous destination registers (like texturing), and
register allocation needs all VGRFs to have sizes between 1 and 4.

Amnesia: The Dark Descent hits this case: a texturing instruction
(4 components) gets rewritten to the gl_FragData output register
(which was 4*3 = 12 components), causing the register allocator to
hit the "we rely on split_virtual_grfs" assertion.

This makes it possible to play Amnesia.

Reviewed-by: Eric Anholt <eric@anholt.net>