Implement basic support for converting constructors in user-defined 
conversions.

Notes:
  - Overload resolution for converting constructors need to prohibit
    user-defined conversions (hence, the test isn't -verify safe yet).
  - We still use hacks for conversions from a class type to itself. 
    This will be the case until we start implicitly declaring the appropriate
    special member functions. (That's next on my list)



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@58513 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaOverload.h b/lib/Sema/SemaOverload.h
index c3fa425..2fd6b1f 100644
--- a/lib/Sema/SemaOverload.h
+++ b/lib/Sema/SemaOverload.h
@@ -114,6 +114,7 @@
     /// is an opaque pointer that can be translated into a QualType.
     void *ToTypePtr;
 
+    void setAsIdentityConversion();        
     ImplicitConversionRank getRank() const;
     bool isPointerConversionToBool() const;
     bool isPointerConversionToVoidPointer(ASTContext& Context) const;