[lworld] Integrated: Merge jdk

[David Simms]

Merge tag 'jdk-16+8' into lworld_merge_jdk_16_8
Added tag jdk-16+8 for changeset 0a73d6f3aab4

# Conflicts:
#	src/hotspot/share/opto/loopopts.cpp

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Commit messages:
 - Merge tag 'jdk-16+8' into lworld_merge_jdk_16_8
 - 8248657: Windows: strengthening in ThreadCritical regarding memory model
 - 8250612: jvmciCompilerToVM.cpp declares jio_printf with "void" return type, should be "int"
 - 8249719: MethodHandle performance suffers from bad ResolvedMethodTable hash function
 - Merge
 - 8250688: missed open parenthesis for GTEST_FRAMEWORK_SRC var in Main.gmk
 - 8250588: Shenandoah: LRB needs to save/restore fp registers for runtime call
 - 8250742: ProblemList serviceability/sa/ClhsdbPstack.java #id0 and #id1 for ZGC
 - 8249643: Clarify DOM documentation
 - 8250580: Address reliance on default constructors in java.rmi
 - ... and 137 more: https://git.openjdk.java.net/valhalla/compare/8816727d...3eb98902

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.java.net/?repo=valhalla&pr=169&range=00.0
 - jdk: https://webrevs.openjdk.java.net/?repo=valhalla&pr=169&range=00.1

Changes: https://git.openjdk.java.net/valhalla/pull/169/files
  Stats: 7400 lines in 509 files changed: 5008 ins; 1064 del; 1328 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/169.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/169/head:pull/169

PR: https://git.openjdk.java.net/valhalla/pull/169