chx230
There is no specific regulation that tells you to do one way or the other. Airbus somewhere says in general about WS on takeoff if you feel you can stop within remaining RW then stop but not specifically for such a case. If runway length is not very critical you should stop because reaching Vr and V2 is not the only problem wind shear can create. It could be worse once airborne. If ASDA was critical hit TOGA and take your chances in the air. Regulation wise I don't think you can be faulted for either of them.