RFR: Merge openjdk/jdk:master

[William Kemper]

Merge tag jdk-20+20, minor conflict in shenandoahControlThread.cpp. Looks good in test pipelines.

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Commit messages:
 - Merge branch 'upstream-merge-test' into merge-jdk20-20
 - Merge jdk-20+20
 - 8294467: Fix sequence-point warnings in Hotspot
 - 8294468: Fix char-subscripts warnings in Hotspot
 - 8295662: jdk/incubator/vector tests fail "assert(VM_Version::supports_avx512vlbw()) failed"
 - 8295668: validate-source failure after JDK-8290011
 - 8295372: CompactNumberFormat handling of number one with decimal part
 - 8295456: (ch) sun.nio.ch.Util::checkBufferPositionAligned gives misleading/incorrect error
 - 8290011: IGV: Remove dead code and cleanup
 - 8290368: Introduce LDAP and RMI protocol-specific object factory filters to JNDI implementation
 - ... and 205 more: https://git.openjdk.org/shenandoah/compare/79a4bd18...8fc3ccdf

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=shenandoah&pr=164&range=00.0
 - openjdk/jdk:master: https://webrevs.openjdk.org/?repo=shenandoah&pr=164&range=00.1

Changes: https://git.openjdk.org/shenandoah/pull/164/files
  Stats: 31261 lines in 1203 files changed: 18280 ins; 8098 del; 4883 mod
  Patch: https://git.openjdk.org/shenandoah/pull/164.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah pull/164/head:pull/164

PR: https://git.openjdk.org/shenandoah/pull/164