RFR: Merge jdk16

[Jesper Wilhelmsson]

Forwardport JDK 16 -> JDK 17

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Commit messages:
 - Merge
 - 8259719: ProblemList runtime/cds/appcds/jigsaw/modulepath/ModulePathAndCP_JFR.java on Windows
 - 8259720: ProblemList java/awt/Focus/AppletInitialFocusTest/AppletInitialFocusTest1.java on Windows
 - 8259722: ProblemList two jdk/jfr/startupargs tests on Windows
 - 8231461: static/instance overload leads to 'unexpected static method found in unbound lookup' when resolving method reference
 - 8259063: Possible deadlock with vtable/itable creation vs concurrent class unloading
 - 8259657: typo in generated HELP page prevents localization
 - 8258272: LoadVectorMaskedNode can't be replaced by zero con
 - 8259560: Zero m68k: "static assertion failed: align" after JDK-8252049
 - 8258985: Parallel WeakProcessor may use too few threads
 - ... and 11 more: https://git.openjdk.java.net/jdk/compare/c7e2174b...64cae854

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.java.net/?repo=jdk&pr=2072&range=00.0
 - jdk16: https://webrevs.openjdk.java.net/?repo=jdk&pr=2072&range=00.1

Changes: https://git.openjdk.java.net/jdk/pull/2072/files
  Stats: 991 lines in 48 files changed: 764 ins; 123 del; 104 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2072.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2072/head:pull/2072

PR: https://git.openjdk.java.net/jdk/pull/2072