RFR: 8265867: thread.hpp defines some enums but no reference

[Coleen Phillimore]

On Mon, 26 Apr 2021 18:54:37 GMT, Xin Liu <xliu at openjdk.org> wrote:

> Deleted 2 useless enums.
> This patch also added const and constexpr for the applicable member functions.

src/hotspot/share/gc/shared/threadLocalAllocBuffer.hpp line 189:

> 187:   static constexpr ByteSize end_offset()         { return byte_offset_of(ThreadLocalAllocBuffer, _end); }
> 188:   static constexpr ByteSize top_offset()         { return byte_offset_of(ThreadLocalAllocBuffer, _top); }
> 189:   static constexpr ByteSize pf_top_offset()      { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top); }

Is constexpr really necessary here?  Isn't this usually a constant expression for most compilers?

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PR: https://git.openjdk.java.net/jdk/pull/3702