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/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 2c5c264..c82820c 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -889,11 +889,11 @@
     // the constructor or conversion operator, and then cope with the
     // standard conversions.
     ImpCastExprToType(From, ToType);
-    break;
+    return false;
 
   case ImplicitConversionSequence::EllipsisConversion:
     assert(false && "Cannot perform an ellipsis conversion");
-    break;
+    return false;
 
   case ImplicitConversionSequence::BadConversion:
     return true;