swift

ae797d43 - [region-isolation] Propagate through the whole source operand instead of just the representative of the source value when constructing assign and merge.

[region-isolation] Propagate through the whole source operand instead of just the representative of the source value when constructing assign and merge. This will let me know the exact source operand used instead of the source value representative. This will ensure that the name associated with the diagnostic is not of the representative value, but the actual value that was the source of the assign. This is an NFCI commit that is an algebraic refactor.