[jdk11u-dev] RFR: 8273547: [11u] [JVMCI] Partial module-info.java backport of JDK-8223332

[Severin Gehwolf]

Please review this trivial partial backport of JDK-8223332. The full patch is too large and isn't worth the risk to backport in full. The issue at hand can be resolved by adding only the exports to the `jdk.internal.vm.ci` module. Thoughts?

Testing: jvmci tests, jvmci bootstrap tests, manual testing of the reproducer and tier1 on Linux x86_64

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Commit messages:
 - 8273547: [11u] [JVMCI] Partial module-info.java backport of JDK-8223332

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/318/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=318&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273547
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/318.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/318/head:pull/318

PR: https://git.openjdk.java.net/jdk11u-dev/pull/318