RFR: Merge lworld

[David Simms]

Merge tag 'jdk-17+12'

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Commit messages:
 - Post merge compilation fixes
 - Merge branch 'lworld' into type-restrictions_merge_lworld_17_12
 - Merge jdk
 - 8260966: (fs) Consolidate Linux and macOS implementations of UserDefinedFileAttributeView
 - 8253100: Fix "no comment" warnings in java.base/java.net
 - 8261483: jdk/dynalink/TypeConverterFactoryMemoryLeakTest.java failed with "AssertionError: Should have GCd a method handle by now"
 - 8261606: Surprising behavior of step over in String switch
 - 8262726: AArch64: C1 StubAssembler::call_RT can corrupt stack
 - 8262819: gc/shenandoah/compiler/TestLinkToNativeRBP.java fails with release VMs
 - 8262461: handle wcstombsdmp return value correctly in unix awt_InputMethod.c
 - ... and 64 more: https://git.openjdk.java.net/valhalla/compare/0a26489c...96378bcd

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - type-restrictions: https://webrevs.openjdk.java.net/?repo=valhalla&pr=359&range=00.0
 - lworld: https://webrevs.openjdk.java.net/?repo=valhalla&pr=359&range=00.1

Changes: https://git.openjdk.java.net/valhalla/pull/359/files
  Stats: 10780 lines in 555 files changed: 5719 ins; 3038 del; 2023 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/359.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/359/head:pull/359

PR: https://git.openjdk.java.net/valhalla/pull/359