[jdk17u-dev] RFR: 8277137: Set OnSpinWaitInst/OnSpinWaitInstCount defaults to "isb"/1 for Arm Neoverse N1

[Evgeny Astigeevich]

Tested:
- `make test TEST=gtest`: Passed
- `make run-test TEST=tier1`: Passed
- `make run-test TEST=tier2`: Passed
- `make run-test TEST=hotspot/jtreg/compiler/onSpinWait`: Passed with an expected failure

Expected failure: https://bugs.openjdk.java.net/browse/JDK-8277503
The failure will be fixed by the backport of JDK-8277503.

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Commit messages:
 - Backport 38345bd28db83371676f1685806ddc207a833879

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/103/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=103&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277137
  Stats: 105 lines in 2 files changed: 105 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/103.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/103/head:pull/103

PR: https://git.openjdk.java.net/jdk17u-dev/pull/103