[vectorIntrinsics] RFR: Merge panama-vector:master

[Paul Sandoz]

Merge master changes into vectorIntrinsics branch.

@nsjian I have problem got the aarch changes wrong, again!

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Commit messages:
 - Merge branch 'master' into merge-master-to-vectorIntrinsics
 - 8180352: Add Stream.toList() method
 - 8256995: [vector] Improve broadcast operations
 - 8254082: AbstractStringBuilder.insert(int dstOffset, CharSequence s, int start, int end) is missing fast-path for String
 - 8256810: Incremental rebuild broken on Macosx
 - 8255001: Move G1PeriodicGCTask to its own file
 - 8256187: [TEST_BUG] Automate bug4275046.java test
 - 8256541: Sort out what version of awk is used in the build system
 - 8257418: C2: Rename barrier data member in MemNode and LoadStoreNode
 - 8257083: Security infra test failures caused by JDK-8202343
 - ... and 159 more: https://git.openjdk.java.net/panama-vector/compare/c1cc01ac...710059bc

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - vectorIntrinsics: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=27&range=00.0
 - panama-vector:master: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=27&range=00.1

Changes: https://git.openjdk.java.net/panama-vector/pull/27/files
  Stats: 153184 lines in 1123 files changed: 123811 ins; 10844 del; 18529 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/27.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/27/head:pull/27

PR: https://git.openjdk.java.net/panama-vector/pull/27