[ecj] Patch: FYI: merge in Classpath 0.93+

[Tom Tromey]

>> Andrew, Gary -- please take a look at the new
>> VMStackWalker.firstNonNullClassLoader.  I copied this in from upstream.

Andrew> Eww.  If that's used anywhere that matters, we have to fix it.  

There's a few uses in Classpath:

./gnu/javax/rmi/CORBA/UtilDelegateImpl.java:      loader = VMStackWalker.firstNonNullClassLoader();
./gnu/java/rmi/server/RMIObjectInputStream.java:                    VMStackWalker.firstNonNullClassLoader());
./gnu/java/rmi/server/RMIObjectInputStream.java:            VMStackWalker.firstNonNullClassLoader());
./java/io/ObjectInputStream.java:    return VMStackWalker.firstNonNullClassLoader();

Tom