Temporarily disable a SILVerifier unit test.
We can't verify that store borrows aren't nested until we can reliably
compute liveness.
This can be fixed in two ways, both of which we plan to do ASAP:
(1) With complete lifetimes, this no longer needs to perform transitive
liveness at all.
(2) findInnerTransitiveGuaranteedUses, which ends up being called on the
load_borrow to compute liveness, can be taught to transitively process
InteriorPointer uses instead of returning PointerEscape. We need to make
sure all uses of the utility need to handle this first.
