swift234

Introduce a new use classifier: "Initialization".  This allows us to
tag things known from SILGen to be initializers (e.g., copyaddrs with
the bit set) and when we analyze the DI properties for an assign, we
can move it to this classification.  This allows stuff that wants to
reason about the difference (e.g. the conditional destroy logic) to
do so precisely.


Swift SVN r10658