RFR: 8287139: aarch64 intrinsic for unsignedMultiplyHigh [v2]

[Raffaello Giulietti]

> Adds aarch64 intrinsic support for `Math.unsignedMultiplyHigh()`

Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:

  8287139: aarch64 intrinsic for unsignedMultiplyHigh

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8840/files
  - new: https://git.openjdk.java.net/jdk/pull/8840/files/14905156..07226edf

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8840&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8840&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8840.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8840/head:pull/8840

PR: https://git.openjdk.java.net/jdk/pull/8840