RFR: 8241502: C2: Migrate x86_64.ad to MacroAssembler [v8]

[John Tortugo]

On Tue, 4 May 2021 19:15:26 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> @vnkozlov - thank you so much for running the tests! The cause of the problems you reported were the last changes I made to the div/mod instructions. I fixed the code and ran all tests again on Linux, macOS, and Windows and they are looking good (jdk tier1, 2, 3, and hotspot_all.
>
> @JohnTortugo  did you fix the last issue? Let me know when I should test it.

Hi @vnkozlov - I just pushed a patch that will handle the assert triggering problem. Thanks again for helping!

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PR: https://git.openjdk.java.net/jdk/pull/2420