Bug 19269 – Cannot throw C++ exceptions from D

When trying to throw `core.stdcpp.exception : exception` from D (the std::exception definition), DMD complains with: ``` foo.d(2): Error: can only throw class objects derived from Throwable, not type core.stdcpp.exception.std.exception ``` Code to reproduce: ``` import core.stdcpp.exception; void main () { throw new exception(); } ```

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