Comment # 27 on bug 68451 from Rune Petersen

fun observation:

Instead of reverting, setting this at the end of r600_cp_dma_copy_buffer()
appears to fix it for me:
    rctx->b.flags |= R600_CONTEXT_INV_VERTEX_CACHE;

(R600_CONTEXT_INV_CONST_CACHE will also work)


Thing I don't understand about this is that if I instead set the flag just
before r600_flush_emit() is called (2 places) the corruption is still there. I
must be missing something.