[jdk17u-dev] RFR: 8273369: Computing micros between two instants unexpectedly overflows for some cases [v2]

[Roland Mesde]

> Backporting JDK-8273369: Computing micros between two instants unexpectedly overflows for some cases. Avoids overflow by not calling nanosUntil() directly, which will overflow beyond Long.MAX_VALUE difference in nano unit.
> 
> Ran GHA Sanity Checks (passed) and related test (passed).

Roland Mesde has updated the pull request incrementally with one additional commit since the last revision:

  Reverted swtch statement (reviewer requested)

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Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/4181/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/4181/files/52b1391b..658eb7bd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4181&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4181&range=00-01

  Stats: 11 lines in 1 file changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/4181.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/4181/head:pull/4181

PR: https://git.openjdk.org/jdk17u-dev/pull/4181