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

[Mark Janes]

Hi Emil,

This is a similar request to the 10.6 cherry-pick request, but without
the EOT patch.  That commit won't apply on 10.5 cleanly, and doesn't
seem to be necessary to avoid the GPU hangs, since Curro's compaction
change wasn't applied to 10.5.

Matt said he'd take a look at fixing up both compaction and EOT, and may
send separate patches for those.

Please cherry-pick these commits to 10.5:

----------------------------------------------------
commit 6c846dc57b1d6f3e015a604dba1976f96c4be9e9
Author: Neil Roberts <neil at linux.intel.com>
Date:   Thu May 28 15:27:31 2015 +0100

    i965: Don't use a temporary when generating an indirect sample
----------------------------------------------------
commit 7f62fdae1629d75dd581d1c57b28c2f099c5ef6b
Author: Neil Roberts <neil at linux.intel.com>
Date:   Fri May 29 13:41:48 2015 +0100

    i965: Don't add base_binding_table_index if it's zero
----------------------------------------------------
commit d46d04529b9c1e55b4c3b65a7078bbbd7ab1a810
Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Jun 2 17:46:38 2015 -0700

    i965: Use UW-typed immediate in multiply inst.
----------------------------------------------------


Thanks!