IRGen: Only mark field offset globals as constant if they won't be updated at runtime #20206
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…dated at runtime Even if we have a constant value, we might be emitting a legacy layout that can be updated in place by newer runtimes. In this case, clients cannot assume the field offsets are constant, and the globals cannot be constant either. Part of <rdar://problem/17528739>.
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Even if we have a constant value, we might be emitting a legacy layout
that can be updated in place by newer runtimes. In this case, clients
cannot assume the field offsets are constant, and the globals cannot
be constant either.
Part of rdar://problem/17528739.