RFR: 8309893: Integrate ReplicateB/S/I/L/F/D nodes to Replicate node [v3]

[Eric Liu]

> This patch creates ReplicateNode to replace ReplicateB/S/I/L/F/DNode, like other vector nodes introduced recently, e.g., PopulateIndexNode and ReverseVNode, etc. This refers from:
> https://mail.openjdk.org/pipermail/panama-dev/2020-April/008484.html
> 
> After merging these nodes, code will be easier to maintain. E.g., matching rules can be simplified.
> 
> Besides AArch64, this patch tries to keep other ad files as the same before, only supplies some necessary predicate. E.g., for matching rules using ReplicateB before, they are now matching Replicate with a new predicate "Matcher::vector_element_basic_type(n) == T_BYTE". This would be easy for review and lower risks.
> 
> [TEST]
> x86:     Tested with option "-XX:UseAVX=0/1/2/3".
> AArch64: Tested on SVE machine and Neon machine.
> 
> Full jtreg passed without new issue.

Eric Liu has updated the pull request incrementally with one additional commit since the last revision:

  fix comment
  
  Change-Id: I892e532ea7b6d884cfbeaf9e55d5c9a26a27ab3a

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14830/files
  - new: https://git.openjdk.org/jdk/pull/14830/files/656334ed..f499ce81

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14830&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14830&range=01-02

  Stats: 45 lines in 3 files changed: 22 ins; 0 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/14830.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14830/head:pull/14830

PR: https://git.openjdk.org/jdk/pull/14830