RFR: 8290290: Remove addition of TimeInstants

[David Holmes]

On Thu, 14 Jul 2022 08:34:27 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this trivial change to remove the unused and semantically suspect
> function TimeInstant::operator+(TimeInstant).

Totally agree: adding time instants is meaningless.

Looks good and trivial (as Thomas already said).

Thanks.

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9489