symbiotic: add dce and constmerge to before-optimizations
symbiotic: add dce and constmerge to before-optimizations

so that we don't create graph for dead code

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>

staticafi/symbiotic,staticafi/symbiotic,staticafi/symbiotic,staticafi/symbiotic