RFR: 8240831: [JVMCI] Export missing vmStructs entries used by JVMCI compilers

[Yudi Zheng]

Hello,

Please review this patch to export a couple missing vmStructs entries to the JVMCI compilers.

http://cr.openjdk.java.net/~yzheng/8240831/webrev.00/ <http://cr.openjdk.java.net/~yzheng/8240831/webrev.00/>
https://bugs.openjdk.java.net/browse/JDK-8240831 <https://bugs.openjdk.java.net/browse/JDK-8240831>

Many thanks,
Yudi