John McCall 0d54a17b52 Set a special flag in class metadata when an Objective-C class ...

has ivars that require destruction, but none that require anything
except zero-initialization.  This is common in ARC and (when true
throughout a class hierarchy) permits the elimination of an
unnecessary message-send during allocation.

llvm-svn: 166088

2012-10-17 04:53:31 +00:00

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