hang when printing exception

[Tom Tromey]

My nightly build started hanging during `make check'.

In my default PATH is a c++filt that doesn't understand `-s java'.
In this case NameFinder seems to get confused.

In some environments I'll just get this:

fleche.  ~/gnu/Nightly/gcc/install/bin/gij T661rpc1
Exception in thread "main" java.lang.IllegalAccessError
*** Got java.lang.NullPointerException while trying to print stack trace.

In others, I'll get a hang.

I looked at the recent changes here but nothing stands out as a
problem.  Anybody experiencing anything similar?

The NullPointerException occurs here, in NameFinder.createStackTraceElement:

    int bracket = s.indexOf('(');

Here `s == null'.

Seems like demangleName should check for a null return from readLine.

Tom