Cast Patch

[Jakub Staszak]

This patch reduces reinterpret_cast usage and changes it to llvm::cast.
Also GetElementPtrInst::getType() method wasn't correct, because it can return VectorType or PointerType.

I couldn't get any testcase because VectorType and PointerType are both SequentialType, so everything worked fine.

Is it OK to commit?

Thanks!
- Kuba
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