OpenCL vec_step feature implementation - Updated

Hi Guy,

Index: lib/Sema/SemaDeclCXX.cpp

It's called __is_convertible and is handle by BinaryTypeTraitExpr.

Sebastian

There is __builtin_types_compatible_p which is represented by
a BinaryTypeTraitExpr in Clang. The *TypeTraitExpr classes are
specialised for boolean results, so I suppose a BinaryTypePropertyExpr
would take two types and produce a non-boolean result, but I cannot
personally think of a situation where this would be a good idea.

Thanks,