[vectorIntrinsics+fp16] Integrated: Merge vectorIntrinsics

[Jatin Bhateja]

Merge vectorIntrinsics into vectorIntrinsics+fp16

All Vector API JTREG and JMH tests compiler and execute cleanly with UseAVX=3

Following two failures will be fixed post-merge:-
    - compiler/vectorapi/TestVectorRotateScalarCount.java
    - compiler/vectorapi/VectorMultiplyOpt.java

Thanks,
Jatin

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Commit messages:
 - Merge branch 'vectorIntrinsics' of http://github.com/openjdk/panama-vector into merge_vectorIntrinsics
 - Merge
 - 8366432: Post-merge aarch64 build fixes
 - Merge
 - 8305563: [vectorapi]: Initial aarch64 backend implementation for FP16 operations
 - Merge panama-vector:vectorIntrinsics
 - 8302454: Improve VectorAPI fallback implementation for FP16 operations.
 - 8300571: FP16 support for VectorAPI Transcendental operations.
 - 8290204: FP16 initial backend implementation
 - 8299373: Extend vector conversion APIs for Halffloat type.
 - ... and 6 more: https://git.openjdk.org/panama-vector/compare/2181a35d...a1e17cf0

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

Changes: https://git.openjdk.org/panama-vector/pull/236/files
  Stats: 45181 lines in 182 files changed: 42352 ins; 330 del; 2499 mod
  Patch: https://git.openjdk.org/panama-vector/pull/236.diff
  Fetch: git fetch https://git.openjdk.org/panama-vector.git pull/236/head:pull/236

PR: https://git.openjdk.org/panama-vector/pull/236