[llvm-commits] PATCH: Simplify comparisons of constant-related pointers, similar to simplifying their difference

[Chandler Carruth]

I recently taught instsimplify to compute the constant difference of two
pointers which are constant-derived from a common base. This uses the same
logic to handle comparisons. These show up all over the place due to C++
pointers-as-iterators comparing against the end iterator.

I'll add a test case before committing, but it's nothing surprising. Just
wanted to double check the actual code before moving forward.
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