Normalize `Vector64/Vector128.Create(0)/Create(0,0, ..)` to `Vector64/Vector128.Zero`

We should normalize `Vector64/Vector128.Create(0)` and `Vector64/Vector128.Create(0, 0, ..)` to become `Vector64/Vector128.Zero` in the morph phase as to take advantage of the optimizations that we are going to have for `Vector64/Vector128.Zero`.