[PATCH] Check dynamic_cast is not used with -fno-rtti

[Arnaud A. de Grandmaison]

Clang emits an error when typeid is used with -fno-rtti, but does not
perform a similar check for dynamic_cast.

The attached patch implements the check.

I have done it late in 'CastOperation::CheckDynamicCast' , as some
dynamic_cast can be resolved statically, and will thus require no
support from the runtime, but we may also want to be more paranoïd.

Any thoughts ?

-- 
Arnaud A. de Grandmaison

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