RFR: 8264016: [JVMCI] add some thread local fields for use by JVMCI

[Tom Rodriguez]

8264016: [JVMCI] add some thread local fields for use by JVMCI

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Commit messages:
 - 8264016: [JVMCI] add some thread local fields for use by JVMCI

Changes: https://git.openjdk.java.net/jdk/pull/3147/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3147&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264016
  Stats: 14 lines in 3 files changed: 14 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3147.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3147/head:pull/3147

PR: https://git.openjdk.java.net/jdk/pull/3147