RFR: 8287139: aarch64 intrinsic for unsignedMultiplyHigh

[Raffaello Giulietti]

On Mon, 23 May 2022 11:59:02 GMT, Raffaello Giulietti <duke at openjdk.java.net> wrote:

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

Verified with hsdis


  0x00000001163fa830:   umulh	x10, x10, x10               ;*invokestatic unsignedMultiplyHigh {reexecute=0 rethrow=0 return_oop=0}
                                                            ; - Umul::main at 17 (line 5)

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