ccaec7ed77
Motivation: It has been observed that passing a null argument to Unsafe.throwException can crash the JVM. Modifications: - PlatformUnsafe0.throwException should honor http://docs.oracle.com/javase/specs/jls/se8/html/jls-14.html#jls-14.18 and throw a NPE Result: No risk of JVM crashing for null argument. Fixes https://github.com/netty/netty/issues/4131