Don't actually add the __unsafe_unretained qualifier in MRC;

driving a canonical difference between that and an unqualified
type is a really bad idea when both are valid.  Instead, remember
that it was there in a non-canonical way, then look for that in
the one place we really care about it: block captures.  The net
effect closely resembles the behavior of a decl attribute, except
still closely following ARC's standard qualifier parsing rules.

llvm-svn: 253534

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