[vectorIntrinsics] RFR: Merge panama-vector:master

[Sandhya Viswanathan]

This pull request merges master changes into vectorIntrinsics.
 
@nsjian Need your help to merge test/hotspot/gtest/aarch64/asmtest.out.h (I have left the git merge markers in place for asmtest.out.h).

Best Regards,
Sandhya

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Commit messages:
 - Merge
 - 8264288: Performance issue with MethodHandle.asCollector
 - 8264729: Random check-in failing header checks.
 - 8264540: WhiteBox.metaspaceReserveAlignment should return shared region alignment
 - 8264512: jdk/test/jdk/java/util/prefs/ExportNode.java relies on default platform encoding
 - 8248862: Implement Enhanced Pseudo-Random Number Generators
 - 8253266: JList and JTable constructors should clear OPAQUE_SET before calling updateUI
 - 8166727: javac crashed: [jimage.dll+0x1942] ImageStrings::find+0x28
 - 8264650: Cross-compilation to macos/aarch64
 - 8264475: CopyArea ignores clip state in metal rendering pipeline
 - ... and 441 more: https://git.openjdk.java.net/panama-vector/compare/8bfdcaae...f38f8122

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - vectorIntrinsics: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=58&range=00.0
 - panama-vector:master: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=58&range=00.1

Changes: https://git.openjdk.java.net/panama-vector/pull/58/files
  Stats: 91523 lines in 3440 files changed: 61692 ins; 16326 del; 13505 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/58.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/58/head:pull/58

PR: https://git.openjdk.java.net/panama-vector/pull/58