RFR: 8258838: Remove JVM option UseStackBanging [v2]

[Doug Simon]

On Fri, 8 Jan 2021 20:23:53 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix copyrights, other minot changes
>
> src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/GraalHotSpotVMConfig.java line 256:
> 
>> 254:     public final int stackShadowPages = getFlag("StackShadowPages", Integer.class);
>> 255:     public final int stackReservedPages = getFlag("StackReservedPages", Integer.class, 0, JDK >= 9);
>> 256:     public final int stackBias = getConstant("STACK_BIAS", Integer.class, 0, JDK < 15);
> 
> The line should be modified instead of removal:
> public final boolean useStackBanging = getFlag("UseStackBanging", Boolean.class, true, JDK < 17);
> @dougxc please note that it should be upstreamed when GraalVM adopt JDK 17.

The good thing is that the VM will fail fail when initializing Graal if the update is not done so there's no way we can overlook it.

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PR: https://git.openjdk.java.net/jdk/pull/1988