RFR: 8278947: Support for array constants in constant table

[Quan Anh Mai]

Hi,

This patch adds support for arrays in compiled code constant tables and uses it for various vector replicate operations on x86.

Test: GHA, linux x64 tier 1-3

Thank you very much.

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Commit messages:
 - missing type in array_constant
 - Merge branch 'master' into constantVector
 - use constant table for remaining types
 - Merge branch 'master' into constantVector
 - refactor
 - replicate using constant
 - Merge branch 'master' into constantVector
 - initial commit

Changes: https://git.openjdk.java.net/jdk/pull/6908/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6908&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278947
  Stats: 292 lines in 6 files changed: 123 ins; 95 del; 74 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6908.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6908/head:pull/6908

PR: https://git.openjdk.java.net/jdk/pull/6908