PATCH to cp-demangle.c for __Uxxxx encoding

[Jason Merrill]

I made this change months ago, but never got around to applying it.  This
implements support for demangling extended characters...so long as they fit
in a char.  So it's currently primarily useful for demangling $ on targets
where the assembler won't accept it.

Applied to trunk only.

2002-07-10  Jason Merrill  <jason@redhat.com>

	* cp-demangle.c (demangle_identifier): Support extended Unicode
	characters.

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