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Fix PR33878: BasicAA incorrectly assumes different address spaces don't alias

Description

Fix PR33878: BasicAA incorrectly assumes different address spaces don't alias
Remove code that assumed that a nullptr of address space != 0 couldnt alias with a non-null pointer. This is incorrect, since nothing can be concluded about a null pointer in an address space != 0.
This code was written before address spaces were introduced

Differential Revision: https://reviews.llvm.org/D37518

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