i965/fs: Make emit_shader_time_end() insert before EOT.

Previously, we emitted the shader-time epilogue from emit_fb_writes(),
during the middle of looping through color regions (or emit_urb_writes
for the VS).  This is duplicated several times and rather awkward.

I need to fix a bug in our FB write handling, and it will be a lot
easier if we move emit_shader_time_end() out of there.

Now, we simply emit FB writes/URB writes, and subsequently have
emit_shader_time_end() insert instructions before the final SEND with
EOT.  Not only is this simpler, it's actually a slight improvement:
we now include the MOVs to set up the final FB write payload in our
shader-time measurements.

Note that INTEL_DEBUG=shader_time only exists on Gen7+, and uses
send-from-GRF.  (In the past, we might have hit trouble where both
attempt to use MRFs for messages; that's not a problem now.)

v2: Rebase on v3 of the previous patch and other shader_time fixes.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Topi Pohjolainen <[email protected]> [v1]
Acked-by: Matt Turner <[email protected]>
Cc: [email protected]

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