Bisecting came up with this as bad commit:

73dd50acf6d244979c2a657906aa56d3ac60d550 is the first bad commit
commit 73dd50acf6d244979c2a657906aa56d3ac60d550
Author: Tapani Pälli <tapani.palli@intel.com>
Date:   Wed Aug 6 09:46:54 2014 +0300

    glsl: implement switch flow control using a loop

    Patch removes old variable based logic for handling a break inside
    switch. Switch is put inside a loop so that existing infrastructure
    for loop flow control can be used for the switch, now also dead code
    elimination works properly.

    Possible 'continue' call inside a switch needs now special handling
    which is taken care of by detecting continue, breaking out and calling
    continue for the outside loop.

    v2: remove one unnecessary ir_expression (Curro)

    Fixes following Piglit tests:

       fs-exec-after-break.shader_test
       fs-conditional-break.shader_test

    No Piglit or es3conform regressions.

    Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
    Reviewed-by: Francisco Jerez <currojerez@riseup.net>

:040000 040000 eac8a47066723ff804317ef11bb006dd0bb80d0f
b73ed6cc78a66c54d684635f69a358fd54f65929 M      src