Add an argmax variant that takes an axis argument.
Add an argmax variant that takes an axis argument.

seibert/numba,stuartarchibald/numba,cpcloud/numba,IntelLabs/numba,numba/numba,cpcloud/numba,numba/numba,numba/numba,stuartarchibald/numba,cpcloud/numba,IntelLabs/numba,IntelLabs/numba,cpcloud/numba,seibert/numba,IntelLabs/numba,seibert/numba,numba/numba,seibert/numba,stuartarchibald/numba,IntelLabs/numba,stuartarchibald/numba,numba/numba,stuartarchibald/numba,cpcloud/numba,seibert/numba