[Mesa-stable] Cherry-pick commit 6ac1bc90 to 10.4 and 10.5

[Matt Turner]

commit 6ac1bc90c4a7a6f32901a9782e14b090f6fe5270
Author: Iago Toral Quiroga <itoral at igalia.com>
Date:   Tue Mar 10 11:36:43 2015 +0100

    i965: Fix out-of-bounds accesses into pull_constant_loc array

Thanks!