RFR: 8349582: APX NDD code generation for OpenJDK [v8]

[Srinivas Vamsi Parasa]

> The goal of this PR is to generate code using APX NDD instructions.

Srinivas Vamsi Parasa has updated the pull request incrementally with one additional commit since the last revision:

  remove unused expand blocks;ndd version of orL_rReg_castP2X

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23501/files
  - new: https://git.openjdk.org/jdk/pull/23501/files/630acb8f..e02ff23c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23501&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23501&range=06-07

  Stats: 43 lines in 1 file changed: 24 ins; 0 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/23501.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23501/head:pull/23501

PR: https://git.openjdk.org/jdk/pull/23501