rename DTorFn to DtorFn to be more consistent with other names. Teach the optimizer that readonly/readnone functions obviously have no side effect, so we don't even need to look at their bodies.
rename DTorFn to DtorFn to be more consistent with other names.
Teach the optimizer that readonly/readnone functions obviously
have no side effect, so we don't even need to look at their bodies.


Swift SVN r2562

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