The changes around expansion of JVMCI counters made in JDK-8230395 were mistaken. They have fortunately been inconsequential since this JVMCI API is not yet used by Graal. That is about to change and so the JVMCI changes should be reverted and the simpler suggestion[1] made by [~dholmes] at the time should be adopted instead.

[1] https://bugs.openjdk.java.net/browse/JDK-8230395?focusedCommentId=14289994&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14289994