Int/Int gives bogus underflow

[p6rt]

Migrated from rt.perl.org#130154 (status was 'new')

Searchable as RT130154$

[p6rt]

From zefram@fysh.org

2e0**-1019
1.78005908680576e-307
2e0**-1020
8.90029543402881e-308
1 / (2**1019)
1.78005908680576e-307
1 / (2**1020)
0

For 1/(2**1020) to underflow to zero is bogus. As you can see, the
exact value of the operation is available in the Num type. Both of the
Int/Int divisions produce Num values.

-zefram

[p6rt]

From @zoffixznet

MoarVM PR fixing this sent​: MoarVM/MoarVM#442