[jdk11u] RFR: Merge jdk11u-dev:master

[Goetz Lindenmaier]

Merge changes for build 3 to jdk11u

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Commit messages:
 - Merge
 - 8248403: AArch64: Remove uses of kernel integer types
 - 8272197: Update 11u GHA workflow with Shenandoah configurations
 - 8225082: Remove IdenTrust certificate that is expiring in September 2021
 - 8230841: Remove oopDesc::equals()
 - 8209768: Refactor java/util/prefs/CheckUserPrefsStorage.sh to plain java test
 - 8213409: Refactor sun.text.IntHashtable:i18n shell tests to plain java tests
 - 8248352: [TEST_BUG] Test test/jdk/java/awt/font/TextLayout/ArabicDiacriticTest.java can leave frame open
 - 8214520: [TEST_BUG] sun/security/mscapi/nonUniqueAliases/NonUniqueAliases.java failed with incorrect jtreg tags order
 - 8262862: Harden tests sun/security/x509/URICertStore/ExtensionsWithLDAP.java and krb5/canonicalize/Test.java
 - ... and 29 more: https://git.openjdk.java.net/jdk11u/compare/fdbaa230...18387aec

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

Changes: https://git.openjdk.java.net/jdk11u/pull/8/files
  Stats: 4139 lines in 168 files changed: 2291 ins; 1360 del; 488 mod
  Patch: https://git.openjdk.java.net/jdk11u/pull/8.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u pull/8/head:pull/8

PR: https://git.openjdk.java.net/jdk11u/pull/8