swift234

fix <rdar://problem/18089574> Protocol member in struct + delegating init miscompilation

When DI processes a delegating initializer of an address-only value type, make sure to
mark the copy_addr as an initialization (as it was already doing for an assign 
instruction) to fix a miscompilation.

The change to DIMemoryUseCollector.cpp is just to facilitate writing testcases.



Swift SVN r21478