[C++ Patch] Fix 66243, silent cast of scoped enum

[Jason Merrill]

On 05/24/2015 07:20 PM, Nathan Sidwell wrote:
> -	  else if (! INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (value)))
> +	  else if (! INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P
> +		   (TREE_TYPE (value)))
>  	    value = perform_implicit_conversion_flags
>  	      (ENUM_UNDERLYING_TYPE (enumtype), value, tf_warning_or_error,
>  	       LOOKUP_IMPLICIT | LOOKUP_NO_NARROWING);

The change is fine, but I wonder why perform_implicit_conversion_flags 
was succeeding?  I would think it should fail.

Jason