Comment 4 for bug 750409

StacktraceTop:
 prepare_wm_constants (brw=0x1cdd1c0) at gen6_wm_state.c:66
 brw_validate_state (brw=0x1cdd1c0) at brw_state_upload.c:397
 brw_try_draw_prims (ctx=0x1cdd1c0, arrays=0x1d2de20, prim=0x7fff8a9252a0, nr_prims=0, ib=0x0, index_bounds_valid=<value optimized out>, min_index=0, max_index=3) at brw_draw.c:362
 brw_draw_prims (ctx=0x1cdd1c0, arrays=0x1d2de20, prim=0x7fff8a9252a0, nr_prims=0, ib=0x0, index_bounds_valid=<value optimized out>, min_index=0, max_index=3) at brw_draw.c:447
 vbo_draw_arrays (ctx=0x1cdd1c0, mode=7, start=0, count=<value optimized out>, numInstances=1) at vbo/vbo_exec_array.c:588