[RAISE-BP] Handle mask for load/store ops

[mfrancepillois]

If initial load/store ops had non-null masks, these masks must be taken into account when rewriting these operations after the data type has been raised to block pointer.
It appears that masks are not supported for load/store ops using block pointers (i.e. using a mask with a block pointer results in a type mismatch error between the pointer and the mask (which should be a tensor)).
The pass therefore needs to be improved to somehow translate the information provided by the masks into the written load/store operations.

[victor-eds]

This is captured by #1784.