RFR: 8285739: disable EA when both JVMTI and Preview are enabled [v2]

[Leonid Mesnik]

On Fri, 20 May 2022 20:09:59 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> The fix disables EscapeBarrier and EscapeAnalysis when certain JVMTI capabilities are enabled and --enable-preview.
>> 
>> It restores the same behavior as it was before https://bugs.openjdk.java.net/browse/JDK-8227745 "Enable Escape Analysis for Better Performance in the Presence of JVMTI Agents" is implemented when Continuations are enabled.
>
> Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:
> 
>   2nd v

This change fixes regression of platform threads behavior with --enabled-preview enabled. However, the info for virtual threads might be incorrect if EA is enabled.
The issue [JDK-8264699](https://bugs.openjdk.java.net/browse/JDK-8264699) Re-examine deopt of frames to allow EA be enabled with JVMTI agents should cover it.

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PR: https://git.openjdk.java.net/jdk/pull/8589