Warcraft has suddenly started to crash on launch with git Mesa on my RV790.
Bisection has identified this commit:

61ed09c7ea41e559219c772f18ea00942d54d30a is the first bad commit
commit 61ed09c7ea41e559219c772f18ea00942d54d30a
Author: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Date:   Mon Jan 4 23:56:08 2016 +0100

    gallium/cso: add support for compute shaders

    Changes from v2:
     - removed cso_{save,restore}_compute_shader() functions and the
       compute_shader_saved variable because disabling compute shaders for
       meta ops is not currently needed

However, I'm not sure I trust bisection here because I have built Mesa from
this revision *twice* and while WoW always crashes with one build, it never
crashes with the other?!

WoW's crash dump only implies that Mesa is trying to read from a null pointer;
I can find no useful stack trace.