[vectorIntrinsics] RFR: Merge panama-vector:master [v2]

[Paul Sandoz]

> Clean merge.
> Needed to fix issues with our internal builds.

Paul Sandoz has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 810 commits:

 - Merge remote-tracking branch 'upstream/master' into merge-with-master
 - Merge panama-vector:master
   
   Reviewed-by: sviswanathan
 - 8283316: Add new vector operation REVERSE_BYTES
   
   Reviewed-by: eliu, jbhateja
 - 8283145: [vector] Add the compiler IR and aarch64 support for count leading and trailing zeros
   
   Reviewed-by: njian, jbhateja
 - 8282942: [vector] Trivial code style updates
   
   Reviewed-by: psandoz
 - 8282915: [vectorapi] Add new vector operation for reverse bits operation
   
   Reviewed-by: psandoz
 - 8282389: Add new vector operations to count leading and trailing zeros.
   
   Reviewed-by: jbhateja, psandoz
 - Fix compilation error in perf reduction tests
   
   Reviewed-by: xgong
 - Post mainline merge fixes
   
   Reviewed-by: sviswanathan
 - Merge panama-vector:master
   
   Reviewed-by: sviswanathan
 - ... and 800 more: https://git.openjdk.java.net/panama-vector/compare/95913067...abf3f9c3

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Changes: https://git.openjdk.java.net/panama-vector/pull/186/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-vector&pr=186&range=01
  Stats: 87154 lines in 199 files changed: 86953 ins; 46 del; 155 mod
  Patch: https://git.openjdk.java.net/panama-vector/pull/186.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-vector pull/186/head:pull/186

PR: https://git.openjdk.java.net/panama-vector/pull/186