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the requirements on the ARC optimizer.

rdar://13407451

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of block declarators.  Document the rule we use.

Also document the rule that Doug implemented a few weeks ago
which drops ownership qualifiers on function result types.

rdar://10127067

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that a __strong object of block type is a valid argument to objc_storeStrong but
that an objc_retain and not an objc_retainBlock will be emitted.

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This enables us to use the same document structure as in other files.


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The adornment:

===
Foo
===

is for titles, not sections.

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Patch by Anastasi Voitova with with small fixes by me.


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