RFR: 8350716: [s390] intrinsify Thread.currentThread() [v2]

[Amit Kumar]

> s390x port for [JDK-8278793](https://bugs.openjdk.org/browse/JDK-8278793)

Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:

  comment from Lutz

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23791/files
  - new: https://git.openjdk.org/jdk/pull/23791/files/60837a28..31c1768d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23791&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23791&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/23791.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23791/head:pull/23791

PR: https://git.openjdk.org/jdk/pull/23791