RFR: 8272736: [JVMCI] Add API for reading and writing JVMCI thread locals [v2]

[Tom Rodriguez]

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

Tom Rodriguez has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

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

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5192/files
  - new: https://git.openjdk.java.net/jdk/pull/5192/files/60a1b4ca..fdddf672

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5192&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5192&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 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