Jordan Rose 0bcf355bc8 [PrintAsObjC] Use 'unsafe_unretained' to print 'unowned', not 'assign' ...

The ObjC generator previously preserved a subtle difference between
'unowned' and 'unowned(unsafe)' / Unmanaged by printing the former as
'assign' and the latter as 'unsafe_unretained'. Upstream Clang,
however, has gotten a new warning to discourage the use of 'assign'
with reference-countable types at all. Since it was always a subtle
distinction, just go with the new convention and print
'unsafe_unretained' for 'unowned' properties as well.

rdar://problem/44290715

2018-09-10 14:32:32 -07:00

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