[Bug-kawa] [bug #38890] Wrong more than one applicable method warning

[Per Bothner]

Update of bug #38890 (project kawa):

                  Status:                    None => Fixed                  
             Assigned to:                    None => bothner                
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

This one was rather tricky.  The second method is actually the addAll method
inherited from Collection.  We adjust the "declaring class" to Set for
improved bytecode binary compatibility, in the same way that javac does. 
However, we did this in a way that confused Kawa's overload resolution.  The
fix was to use two different Method objects for the two different purposes
(overload resolution/type-checking vs code-generation).

Fix and testcase checked in.

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