[Mesa-stable] Nominating b9aa0fa7d646f9ebb0a2e08d262c2eebfd875610 for 17.2

[Emil Velikov]

We'd want the following fix for 17.2. Note that 17.3 already incorporates it.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103732

commit b9aa0fa7d646f9ebb0a2e08d262c2eebfd875610
Author: George Kyriazis <george.kyriazis at intel.com>
Date:   Wed Sep 13 21:06:44 2017 -0500

   swr: Handle resource across context changes


-Emil