[PATCH] Fix an assertion failure trying to emit a trivial destructor in ObjC++

[Ben Langmuir]

Hi John,

This patch fixes the assertion failure I talked to you about in Objective C++ codegen.  It turned out to have nothing to do with templates.

    Fix an assertion failure trying to emit a trivial destructor in ObjC++
    
    If a base class declares a destructor, we will add the implicit
    destructor for the subclass in
    ActOnFields -> AddImplicitlyDeclaredMembersToClass
    
    But in Objective C++, we did not compute whether we have a trivial
    destructor until after that in
    CXXRecordDecl::completeDefinition()
    
    This was leading to a mismatch between the class, which thought it had
    no trivial destructor, and the CXXDestructorDecl, which considered
    itself trivial.


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