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

[Andrew Haley]

Tom Tromey writes:
 > >> 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();

OK, definitely.  ObjectInputStream is very important,
performance-wise.  We need another specialization in VMStackWalker.

Andrew.