i965/fs: Don't use backend_visitor::instructions after creating the CFG.
This is a fix for a regression introduced in commit a9f8296d ("i965/fs: Preserve the CFG in a few more places."). The errata this code works around is described in a comment before the function: "[DevBW, DevCL] Errata: A destination register from a send can not be used as a destination register until after it has been sourced by an instruction with a different destination register. The framebuffer write's sources must be in message registers, which SEND instructions cannot have as a destination. There's no way for this errata to affect anything at the end of the program. Just remove the code. Cc: 10.4, 10.5 <mesa-stable@lists.freedesktop.org> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84613 Reviewed-by:Kenneth Graunke <kenneth@whitecape.org> (cherry picked from commit e214000f)
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