gdb patch for 64-bit enum values on 64-bit hosts (ia64-linux)

[James Wilson]

	Um, again, shouldn't this be LONGEST?

What is LONGEST, what are the rules for its use, and what are the implications
of trying to use it?

I am aware that my patches aren't going to work for cross debuggers from
32-bit hosts to 64-bit targets, but right now I'm not worried about that.
I need to get the native 64-bit debugger working correctly, and I don't have
time at the moment to worry about the cross debugger case.

Jim