RFR: Merge jdk8u:master

[Andrew John Hughes]

Merge jdk8u402-b06

GHA builds will not work until [JDK-8293107](https://bugs.openjdk.org/browse/JDK-8293107) is merged in 8u462-b01

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Commit messages:
 - Merge jdk8u402-b06
 - 8317547: Enhance TLS connection support
 - 8316976: Improve signature handling
 - 8314468: Improve Compiler loops
 - 8314307: Improve loop handling
 - 8314295: Enhance verification of verifier
 - 8314284: Enhance Nashorn performance
 - 8308204: Enhanced certificate processing
 - 8320597: RSA signature verification fails on signed data that does not encode params correctly
 - 8302017: Allocate BadPaddingException only if it will be thrown

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=shenandoah-jdk8u&pr=65&range=00.0
 - jdk8u:master: https://webrevs.openjdk.org/?repo=shenandoah-jdk8u&pr=65&range=00.1

Changes: https://git.openjdk.org/shenandoah-jdk8u/pull/65/files
  Stats: 928 lines in 20 files changed: 643 ins; 114 del; 171 mod
  Patch: https://git.openjdk.org/shenandoah-jdk8u/pull/65.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk8u.git pull/65/head:pull/65

PR: https://git.openjdk.org/shenandoah-jdk8u/pull/65