[patch rfc] use typedef opaque type implementations

[Andrew Cagney]

This patch follows up an earlier thread that pointed out that GDB is 
pretty broken when it comes to debugging a program that contains 
multiple struct definitions (e.g., gdb).

The attached patch implements the suggested `fix'.  Declare a file-local 
typedef and then use that.  I've applied it to the ui-out code.  A quick 
debug suggests that it works well.

comments?  I'll table this for a week ...
Andrew
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