We no longer need `offset_of` in HotSpot code, and can instead directly use `offsetof`. One benefit of this is that offsetof is constexpr, which we should try to make use of when converting uses. (That means the update shouldn't be done as a simple sed script replacement, and maybe should be broken up into chunks.)
- relates to
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JDK-8367984 Eliminate offset_of in vmStructs
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- Open
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JDK-8300080 offset_of for GCC/Clang exhibits undefined behavior and is not always a compile-time constant
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- Resolved
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