[jdk18] RFR: 8278489: Preserve result in native wrapper with +UseHeavyMonitors [v3]

[Aleksey Shipilev]

On Tue, 21 Dec 2021 16:13:04 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> Testing observed a few failures after JDK-8276901. The reason for the failures is in the native-wrappers, in the +UseHeavyMonitors paths, we don't preserve the result register after the native call.
>> 
>> Testing:
>>  - [x] java/awt/color, sun/java2d/cmm tests (x86_32, x86_64, aarch64 x -UseHeavyMonitors, +UseHeavyMonitors)
>>  - [x] tier1 (x86_32, x86_64, aarch64 x -UseHeavyMonitors, +UseHeavyMonitors)
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   AArch64 port

Looks fine to me, but someone else should take a look too.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk18/pull/16