RFR: 8270453: [JVMCI] remove duplicates in vmStructs_jvmci.cpp

[Doug Simon]

On Wed, 14 Jul 2021 16:01:45 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Removes some duplicate exports in vmStructs_jvmci.cpp.
>> 
>> I've tested by comparing the output of `java -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+EagerJVMCI -Djvmci.PrintConfig=true -version` before and after this change.
>
> Good and trivial.
> 
> Duplicates were added by 
> [8257020](https://bugs.openjdk.java.net/browse/JDK-8257020): [JVMCI] enable a JVMCICompiler to specify which GCs it supports

Thanks for the review @vnkozlov .

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PR: https://git.openjdk.java.net/jdk/pull/4779