We see massive failures of the following test in Valhalla with non-default VM options like '-XX:-UseCompressedOops -XX:-UseCompressedClassPointers -Xint' or '-XX:+UseZGC -Xint' (see attached log files):

test/hotspot/jtreg/runtime/valhalla/inlinetypes/field_layout/ValueFieldInheritanceTest.java
test/hotspot/jtreg/runtime/valhalla/inlinetypes/field_layout/FieldAlignmentTest.java
test/hotspot/jtreg/runtime/valhalla/inlinetypes/field_layout/NullMarkersTest.java

java.lang.NullPointerException: Cannot read field "nonStaticFields" because "<local4>" is null
at FieldLayoutAnalyzer.checkSubClasses(FieldLayoutAnalyzer.java:506)
at FieldLayoutAnalyzer.check(FieldLayoutAnalyzer.java:581)
at ValueFieldInheritanceTest.main(ValueFieldInheritanceTest.java:240)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1575)