[parc][amo] Fix amo_min by making the comparison signed
[parc][amo] Fix amo_min by making the comparison signed

The amo_min implementation assumes unsigned min function. To fix this, the values are converted to signed to make python perform a signed minimum.

futurecore/pydgin,futurecore/pydgin,cornell-brg/pydgin,futurecore/pydgin,cornell-brg/pydgin,futurecore/pydgin,cornell-brg/pydgin,cornell-brg/pydgin