RFR: 8272736: [JVMCI] Add API for reading and writing JVMCI thread locals

[Tom Rodriguez]

8272736: [JVMCI] Add API for reading and writing JVMCI thread locals

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Commit messages:
 - 8272736: [JVMCI] Add API for reading and writing JVMCI thread locals

Changes: https://git.openjdk.java.net/jdk/pull/5192/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5192&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272736
  Stats: 137 lines in 6 files changed: 131 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5192.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5192/head:pull/5192

PR: https://git.openjdk.java.net/jdk/pull/5192