[jdk25u] RFR: 8364597: Replace THL A29 Limited with Tencent

[John Jiang]

Please review this backport of `JDK-8364597: Replace THL A29 Limited with Tencent`.

This backport is not clean, because the following files have different copyright notes between the repos.
- src/hotspot/cpu/x86/stubGenerator_x86_64_pow.cpp
- src/hotspot/cpu/x86/stubGenerator_x86_64_log.cpp
- src/hotspot/cpu/x86/stubGenerator_x86_64_exp.cpp

-------------

Commit messages:
 - Backport 4c9eaddaef83c6ba30e27ae3e0d16caeeec206cb

Changes: https://git.openjdk.org/jdk25u/pull/158/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=158&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364597
  Stats: 67 lines in 58 files changed: 0 ins; 9 del; 58 mod
  Patch: https://git.openjdk.org/jdk25u/pull/158.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/158/head:pull/158

PR: https://git.openjdk.org/jdk25u/pull/158