Abort when compiling current CVS tree.

[Glenn Chambers]

While using the latest GCJ and LIBGCJ CVS trees, I got a compiler 
abort in java/decl.c, routine insert_block while compiling Connection.java
in directory gnu/gcj/protocol/jar.

Examining the compiler source, I found a call to 'abort', with no 
comment explaining why it was there.  (I presume that one or more
of the recently added middle-end optimizations are suddenly calling 
this routine, which was never called before.)

Just for giggles, I commented it out and rebuilt the compiler.
Connection.java now compiles without error.  The build hasn't finished,
so I can't test to see if the function actually works.

I'm using the mainline (2.96) branch of both trees.

Any clues?