Add test cases for fastmath flag
Add test cases for fastmath flag

stuartarchibald/numba,IntelLabs/numba,numba/numba,sklam/numba,seibert/numba,numba/numba,sklam/numba,gmarkall/numba,seibert/numba,jriehl/numba,IntelLabs/numba,numba/numba,stuartarchibald/numba,cpcloud/numba,stonebig/numba,stonebig/numba,IntelLabs/numba,IntelLabs/numba,numba/numba,sklam/numba,gmarkall/numba,sklam/numba,cpcloud/numba,jriehl/numba,stuartarchibald/numba,gmarkall/numba,jriehl/numba,numba/numba,stuartarchibald/numba,cpcloud/numba,seibert/numba,stuartarchibald/numba,cpcloud/numba,seibert/numba,cpcloud/numba,stonebig/numba,jriehl/numba,IntelLabs/numba,seibert/numba,gmarkall/numba,stonebig/numba,jriehl/numba,sklam/numba,gmarkall/numba,stonebig/numba