Patch to fix PR9861

[Andrew Haley]

TJ Laurenzo writes:
 > I am attaching a revised patch that corrects the ambiguity problem in
 > accordance with Ian's suggestion.  It includes an update to the
 > demangler and test cases to support it.
 > 
 > It should be noted that with this patch applied, mangled names
 > produced by the Java and C++ compilers for methods of Java classes
 > cannot be demangled by old tools until they are patched with the
 > libiberty cp-demangle.c updates included in this patch.
 > 
 > Of course, this patch also breaks old-style Java binary compatibility
 > (such as exists to begin with).
 > 
 > I have built and successfully run the testsuite with this patch
 > against i686-pc-linux-gnu.

I wonder what this does to debugging.  I'm going to try it now.

Andrew.