Test fails with the following stack trace:
java.lang.RuntimeException: assertTrue: expected true, was false
        at jdk.test.lib.Asserts.fail(Asserts.java:594)
        at jdk.test.lib.Asserts.assertTrue(Asserts.java:486)
        at jdk.test.lib.Asserts.assertTrue(Asserts.java:472)
        at runtime.valhalla.inlinetypes.InlineTypeArray.testSanityCheckcasts(InlineTypeArray.java:289)
        at runtime.valhalla.inlinetypes.InlineTypeArray.run(InlineTypeArray.java:58)
        at runtime.valhalla.inlinetypes.InlineTypeArray.main(InlineTypeArray.java:47)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
        at java.base/java.lang.Thread.run(Thread.java:831)


The class file generated by javac seems correct:

void testSanityCheckcasts();
    descriptor: ()V
    flags: (0x0000)
    Code:
      stack=2, locals=18, args_size=1
         0: iconst_1
         1: anewarray #276 // class "Qruntime/valhalla/inlinetypes/InlineTypeArray$MyInt;"
         4: astore_1
         5: aload_1
         6: instanceof #278 // class "[Ljava/lang/Object;"
         9: invokestatic #72 // Method jdk/test/lib/Asserts.assertTrue:(Z)V
        12: aload_1
        13: instanceof #280 // class "[Ljava/lang/Comparable;"
        16: invokestatic #72 // Method jdk/test/lib/Asserts.assertTrue:(Z)V
        19: aload_1
        20: instanceof #282 // class "[Lruntime/valhalla/inlinetypes/InlineTypeArray$MyInt;"

But the implementation of the instanceof bytecode fails to recognize that InlineTypeArray$MyInt[] is a subtype of InlineTypeArray$MyInt.ref[].