Bug 22752 – _d_delThrowable() may crash if a foreign Throwable object is being finalized by the GC

It's currently possible to return a Throwable object from a D-DLL and throw it in the main application. While this is questionable use case - it's also a workaround for the poor DLL-support because throwing from a DLL function directly crashes. However, while earlier builds just crashes immediately if a foreign Throwable object was thrown now the Throwable can be thrown but a timed bomb is plant in _d_delThrowable() which causes the program later to crash if the GC decides to finialize it later.

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