[AArch64][GlobalISel] Fold a chain of two G_PTR_ADDs of constant offsets.
E.g. %addr1 = G_PTR_ADD %base, G_CONSTANT 20 %addr2 = G_PTR_ADD %addr1, G_CONSTANT 8 --> %addr2 = G_PTR_ADD %base, G_CONSTANT 28 Differential Revision: https://reviews.llvm.org/D72351
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