RFR: Merge jdk

[Mikael Vidstedt]

Merge in jdk-15+28

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Commit messages:
 - Merge jdk
 - 8247526: [TESTBUG] runtime/cds/appcds/dynamicArchive tests failing with Graal
 - 8236539: Relative link tags in record javadoc don't resolve
 - 8246098: API for Class::permittedSubclasses should clarify if returned elements are ordered or not
 - 8211977: move testlibrary tests into one place
 - 8247528: runtime/cds/appcds/jigsaw/modulepath/OptimizeModuleHandlingTest.java failing with Graal
 - 8247660: 12 Uninitialised variable in 1 files
 - 8247421: ReturnBlobToWrongHeapTest.java failed allocating blob
 - 8236647: java/lang/invoke/CallSiteTest.java failed with InvocationTargetException in Graal mode
 - 8246077: Cloneable test in HmacCore seems questionable
 - ... and 21 more: https://git.openjdk.java.net/portola/compare/1a843cf1...4d132569

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.java.net/portola/pull/6/files
  Stats: 3439 lines in 103 files changed: 2045 ins; 1195 del; 199 mod
  Patch: https://git.openjdk.java.net/portola/pull/6.diff
  Fetch: git fetch https://git.openjdk.java.net/portola pull/6/head:pull/6

PR: https://git.openjdk.java.net/portola/pull/6