RFR: Merge jdk18

[Jesper Wilhelmsson]

Forwardport JDK 18 -> JDK 19

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Commit messages:
 - Merge
 - 8280233: Temporarily disable Unix domain sockets in Windows PipeImpl
 - 8278834: Error "Cannot read field "sym" because "this.lvar[od]" is null" when compiling
 - 8272058: 25 Null pointer dereference defect groups in 4 files
 - 8280234: AArch64 "core" variant does not build after JDK-8270947
 - 8280155: [PPC64, s390] frame size checks are not yet correct
 - 8273383: vmTestbase/vm/gc/containers/Combination05/TestDescription.java crashes verifying length of DCQS
 - 8279654: jdk/incubator/vector/Vector256ConversionTests.java crashes randomly with SVE
 - 8278417: Closed test fails after JDK-8276108 on aarch64
 - 8274096: Improve decoding of image files
 - ... and 30 more: https://git.openjdk.java.net/jdk/compare/98d96a77...e0d83a07

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.java.net/?repo=jdk&pr=7151&range=00.0
 - jdk18: https://webrevs.openjdk.java.net/?repo=jdk&pr=7151&range=00.1

Changes: https://git.openjdk.java.net/jdk/pull/7151/files
  Stats: 1732 lines in 67 files changed: 933 ins; 606 del; 193 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7151.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7151/head:pull/7151

PR: https://git.openjdk.java.net/jdk/pull/7151