RFR: 8068958: Timestamp.from(Instant) should throw when conversion is not possible [v3]

[Eamonn McManus]

> Multiplying with `*` never produces `ArithmeticException`, so the catch in the existing code is never triggered. `Math.multiplyExact` does produce `ArithmeticException` if the multiplication overflows. So we can use that, and rethrow `IllegalArgumentException` as the specification says.
> 
> There is a small compatibility risk, in that code may have been relying on the previous silent overflow, and will now get an exception. But an exception is surely better than the nonsense results that overflow produces.
> 
> Thanks to Kurt Kluever for the test cases.

Eamonn McManus has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright year.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17181/files
  - new: https://git.openjdk.org/jdk/pull/17181/files/8f2e929c..9f3cbf12

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17181&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17181&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17181.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17181/head:pull/17181

PR: https://git.openjdk.org/jdk/pull/17181