Use the nuw attribute of GEPs to prove that pointers do not alias, in
cases matching the following:
+ + +
| BaseOffset | +<nuw> Indices |
---------------->|-------------------->|
|-->V2Size | |-------> V1Size
LHS RHS
If the difference between pointers is Offset +<nuw> Indices then we know
that the addition does not wrap the pointer index type (add nuw) and the
constant Offset is a lower bound on the distance between the pointers. We
can then prove NoAlias via Offset u>= V2Size.
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