Bugfix for PointerObservations transformer

[bhermann]

Thanks to Patrick Müller we have a bugfix for my faulty implementation of PointerObservations.cpp.

Here is my buggy line:

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Constant* strVal = ConstantExpr::getGetElementPtr(Type::getInt8PtrTy(ctx), GVStr, indices, true);

And here is Patrick's fixed version:

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Constant* strVal = ConstantExpr::getGetElementPtr(0, GVStr, indices, true);

He is cleverly using an implementation detail of the called function:

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if (!Ty)
  Ty = cast<PointerType>(C->getType()->getScalarType())->getElementType();