[Mesa-stable] Cherry-pick Braswell commits to 10.5

[Matt Turner]

So they know, Curro and Ben were Cc'd here because we intended to
cherry-pick their compaction fixes

commit 35a77a148f8b7ef03fe3b31d63719e0bfdf4b783
Author: Francisco Jerez <currojerez at riseup.net>
Date:   Fri Jan 30 17:50:35 2015 +0200

    i965: Don't compact instructions with unmapped bits.

commit b307921c3ff3b36607752f881a180272366a79cf
Author: Ben Widawsky <benjamin.widawsky at intel.com>
Date:   Wed May 27 17:55:02 2015 -0700

    i965: Disable compaction for EOT send messages

to 10.5, but they don't apply cleanly. I'll send a separate pick
request for them.