RFR: 8167180: [JVMCI] Exported elements referring to inaccessible types in jdk.vm.ci

[Doug Simon]

Please review this change which JVMCI API changes to address lint warnings introduced by https://bugs.openjdk.java.net/browse/JDK-8153362.

JVMCI currently exports a few service types that are in exported packages so that a ServiceLoader can load them. The problem is that some of these service types reference other JVMCI types that are not in exported packages as reported by the new lint check. To address this mixing of exported and non-exported types, this webrev introduces a new (meta) service, jdk.vm.ci.services.JVMCIAccess, that is now used to get providers for all other services:

jdk.vm.ci.runtime.JVMCICompilerFactory
jdk.vm.ci.hotspot.HotSpotVMEventListener

All uses of JVMCIAccess are subject to SecurityManager checks.

https://bugs.openjdk.java.net/browse/JDK-8167180
http://cr.openjdk.java.net/~dnsimon/8167180/

-Doug