[cfe-dev] More Objective-C fixes

[David Chisnall]

Hi,

This fixes message sends to super in a way that both works with real  
code and passes the test in the test suite.  It also fixes a crash  
when using recent versions of GNU libobjc and compiling modules that  
do not contain any constant strings but do contain a declaration of  
the constant string class and possible some other corner cases (thanks  
to Pete French for providing me with a test case for that one).

David

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