We just discovered some intermittent IR Test failures for these tests:

compiler/vectorization/runner/LoopReductionOpTest.java
compiler/vectorization/runner/LoopArrayIndexComputeTest.java
compiler/vectorization/runner/ArrayTypeConvertTest.java
compiler/vectorization/runner/ArrayShiftOpTest.java
(more tests may be affected)

They all have edited IR Rules with JDK-8298632.
https://git.openjdk.org/jdk/pull/11687
https://git.openjdk.org/jdk/commit/715b509f3d3dd2e8ef75f8e710becc959dd538e0


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Example failure for LoopReductionOpTest.java:

Failed IR Rules (3) of Methods (2)
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1) Method "public int compiler.vectorization.runner.LoopReductionOpTest.reductionAddSumOfMultiple()" - [Failed IR rules: 2]:
   * @IR rule 1: "@compiler.lib.ir_framework.IR(phase={DEFAULT}, applyIfCPUFeatureAnd={}, applyIfCPUFeatureOr={"sve", "true", "sse2", "true"}, applyIf={}, applyIfCPUFeature={}, counts={"_#LOAD_VECTOR#_", ">0"}, failOn={}, applyIfAnd={}, applyIfOr={}, applyIfNot={})"
     > Phase "PrintIdeal":
       - counts: Graph contains wrong number of nodes:
         * Constraint 1: "(\\d+(\\s){2}(LoadVector.*)+(\\s){2}===.*)"
           - Failed comparison: [found] 0 > 0 [given]
           - No nodes matched!
   * @IR rule 2: "@compiler.lib.ir_framework.IR(phase={DEFAULT}, applyIfCPUFeatureAnd={}, applyIfCPUFeatureOr={"sve", "true", "sse2", "true"}, applyIf={}, applyIfCPUFeature={}, counts={"_#ADD_REDUCTION_V#_", ">0"}, failOn={}, applyIfAnd={}, applyIfOr={}, applyIfNot={})"
     > Phase "PrintIdeal":
       - counts: Graph contains wrong number of nodes:
         * Constraint 1: "(\\d+(\\s){2}(AddReductionV(B|S|I|L|F|D).*)+(\\s){2}===.*)"
           - Failed comparison: [found] 0 > 0 [given]
           - No nodes matched!

2) Method "public long compiler.vectorization.runner.LoopReductionOpTest.reductionWithNonReductionDifferentSizes()" - [Failed IR rules: 1]:
   * @IR rule 2: "@compiler.lib.ir_framework.IR(phase={DEFAULT}, applyIfCPUFeatureAnd={}, applyIfCPUFeatureOr={"sse2", "true"}, applyIf={}, applyIfCPUFeature={}, counts={"_#ADD_REDUCTION_V#_", ">0"}, failOn={}, applyIfAnd={}, applyIfOr={}, applyIfNot={})"
     > Phase "PrintIdeal":
       - counts: Graph contains wrong number of nodes:
         * Constraint 1: "(\\d+(\\s){2}(AddReductionV(B|S|I|L|F|D).*)+(\\s){2}===.*)"
           - Failed comparison: [found] 0 > 0 [given]
           - No nodes matched!