RFR: 8280007: Enable Neoverse N1 optimizations for Arm Neoverse V1 & N2

[Bhavana-Kilambi]

As Arm Neoverse V1 and N2s will benefit from the same optimizations as Neoverse N1 does, it should have OnSpinWaitInst/OnSpinWaitInstCount defaults set to "isb"/1 and UseSIMDForMemoryOps default set to true.
This patch sets these flags accordingly for both V1 and N2 architectures.

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Commit messages:
 - 8280007: Enable Neoverse N1 optimizations for Arm Neoverse V1 & N2

Changes: https://git.openjdk.java.net/jdk/pull/7383/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7383&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280007
  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7383.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7383/head:pull/7383

PR: https://git.openjdk.java.net/jdk/pull/7383