jni/nullCaller/NullCallerTest.java fails on PPC64 since JDK-8281001:

 stdout: [];
 stderr: []
 exitValue = 139

java.lang.RuntimeException: Expected to get exit value of [0]

at jdk.test.lib.process.OutputAnalyzer.shouldHaveExitValue(OutputAnalyzer.java:489)
at NullCallerTest.main(NullCallerTest.java:111)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:312)
at java.base/java.lang.Thread.run(Thread.java:1596)


Exit code 139 seems to indicate a SIGSEGV inside of the library code when "<iostream>" is included.
Reverting to "<stdio.h>" fixes the issue.