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8277503: compiler/onSpinWait/TestOnSpinWaitAArch64DefaultFlags.java failed with "OnSpinWaitInst with the expected value 'isb' not found." #6521

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@@ -75,8 +75,6 @@ compiler/whitebox/MakeMethodNotCompilableTest.java 8265360 macosx-aarch64
compiler/codecache/jmx/PoolsIndependenceTest.java 8264632 macosx-x64
compiler/codecache/TestStressCodeBuffers.java 8272094 generic-aarch64

compiler/onSpinWait/TestOnSpinWaitAArch64DefaultFlags.java 8277503 linux-aarch64


#############################################################################

@@ -87,7 +87,8 @@ public static void main(String[] args) throws Exception {
final String cpuModel = cpuFeatures.get(0);

if (isCPUModelNeoverseN1(cpuModel)) {
checkFinalFlagsEqualTo(ProcessTools.createJavaProcessBuilder("-XX:+PrintFlagsFinal", "-version"), "isb", "1");
checkFinalFlagsEqualTo(ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions", "-XX:+PrintFlagsFinal", "-version"),
"isb", "1");
checkFinalFlagsEqualTo(ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions", "-XX:OnSpinWaitInstCount=2", "-XX:+PrintFlagsFinal", "-version"),
"isb", "2");
} else {