[SemaCXX11 patch] Patch to prevent a crash when attempting to call a 'deleted' constructor

[jahanian]

This patch fixes a crash in release build clang and produces the desired diagnostic.
In the debug build clang it does not crash but produces a misleading diagnostic.

Problem is that in TryUserDefinedConversion(…)
We have: 
case OR_Deleted:
// ….
if (CXXConstructorDecl *Constructor
          = dyn_cast<CXXConstructorDecl>(ICS.UserDefined.ConversionFunction)) {
// …
}

And ICS.UserDefined.ConversionFunction never gets set for a ‘delete’ constructor.

Please review.

- Fariborz


	
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