RFR: 8258953: AArch64: move NEON instructions to aarch64_neon.ad [v2]

[Dong Bo]

> As discussed in [1], all NEON instructions should be moved from `aarch64.ad` to `aarch64_neon.ad`.
> 
> In the first commit [2] of this PR, the NEON instructions are deleted from `aarch64.ad` and appended to `aarch64_neon.ad`.
> I compared the generated code in `aarch64_neon.ad` with original code in `aarch64.ad`, no suspicious differences found.
> The last two commits just simply move code around in `aarch64_neon.ad` to put related instructions together, i.e. `LoadStore` [3], `Reduction` [4].
> 
> This also supports vector length 4 for `vsraa8B_imm` and `vsrla8B_imm`, vector length 2 for `vsraa4S_imm` and `vsrla4S_imm`, fixes few typos, e.g. `vor8B`, `vsrla4S_imm`.
> 
> [1] https://github.com/openjdk/jdk/pull/1215#issuecomment-728186803
> [2] https://github.com/dgbo/jdk/commit/40cbe99e647cdf93712edf8f77ab3b5b30ea0a95
> [3] https://github.com/dgbo/jdk/commit/695fb8f8ef009b733a8f804e791347f4bfe2572e
> [4] https://github.com/dgbo/jdk/commit/e0c38aa9aaa6af9925a3821328384b1e2b2c2070

Dong Bo has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:

  8258953: AArch64: move NEON instructions to aarch64_neon.ad

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Changes: https://git.openjdk.java.net/jdk/pull/2273/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2273&range=01
  Stats: 5661 lines in 3 files changed: 3216 ins; 2435 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2273.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2273/head:pull/2273

PR: https://git.openjdk.java.net/jdk/pull/2273