6536943: Bogus -Xcheck:jni warning for SIG_INT action for SIGINT in JVM started from non-interactive shell Summary: Under non-interactive shell, with -Xcheck:jni, check_signal_handler will print out Warning for SHURDOWN2_SIGNAL (SIGINT) which is replaced by non-interactive shell. Fix by supply more information of the replacement to user. Reviewed-by: acorn, dsamersoff Contributed-by: yumin.qi@oracle.com

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