known-incremented level, because the two concepts can be used
to prove the saftey of a retain+release removal in different
ways.
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of the instruction.
Note that this change affects the existing non-atomic load and store
instructions; the parser now accepts both forms, and the change is noted
in the release notes.
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the retains and releases all use the same SSA pointer value.
Also, don't let CFG hazards disrupt nested retain+release pair
optimizations.
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so that a declaration for objc_retain is created when needed if it doesn't
already exist. rdar://9825114.
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