[Bug 91969] [radeonsi][bonaire] Stalls with Borderlands 2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91969

            Bug ID: 91969
           Summary: [radeonsi][bonaire] Stalls with Borderlands 2
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: shawn.starr at rogers.com
        QA Contact: dri-devel at lists.freedesktop.org

kernel 4.3.0-rc0 (Fedora snapshot)
mesa git master / with also experimental radeonsi shader cache (still stalls
with it even)
LLVM trunk (Sept 10th, 2015 build)

I've done some profiling of Borderlands 2 (just the menu intro) and discovered
what may be causing the stalls.

Apitrace: https://drive.google.com/open?id=0Bze7CJKD12nORWQ4RTdIbk4zT1k

Results from profile show the following calls with spikes:

25208614 [glDrawRangeElements]
25208651 [glLinkProgram]
29526799 [glDrawRangeElements]
29526657 [glDrawRangeElements]

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