[vectorIntrinsics] RFR: Merge panama-vector:master

[Sandhya Viswanathan]

Merge master changes into vectorIntrinsics branch.

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Commit messages:
 - Merge
 - 8255031: Update java/util/prefs/AddNodeChangeListener.java to report more failure info
 - 8255262: Remove use of legacy custom @spec tag
 - 8254854: [cgroups v1] Metric limits not properly detected on some join controller combinations
 - 8248411: [aarch64] Insufficient error handling when CodeBuffer is exhausted
 - 8223312: Utilize handshakes instead of is_thread_fully_suspended
 - 8255196: Remove unused G1FullGCCompactionPoint::merge()
 - 8255047: Add HotSpot UseDebuggerErgo flags
 - 8255124: KeepAliveStreamCleaner may crash with java.lang.IllegalMonitorStateException: current thread is not owner
 - 8198395: Test javax/swing/plaf/metal/MetalLookAndFeel/Test8039750.java fails in mach5
 - ... and 143 more: https://git.openjdk.java.net/panama-vector/compare/44489877...679d3a52

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - vectorIntrinsics: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=17&range=00.0
 - panama-vector:master: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=17&range=00.1

Changes: https://git.openjdk.java.net/panama-vector/pull/17/files
  Stats: 45617 lines in 842 files changed: 29682 ins; 12231 del; 3704 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/17.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/17/head:pull/17

PR: https://git.openjdk.java.net/panama-vector/pull/17