[AMDGPU][GISel] Only fold flat offsets if they are inbounds (#153001) For flat memory instructions where the address is supplied as a base address register with an immediate offset, the memory aperture test ignores the immediate offset. Currently, ISel does not respect that, which leads to miscompilations where valid input programs crash when the address computation relies on the immediate offset to get the base address in the proper memory aperture. Global or scratch instructions are not affected. This patch only selects flat instructions with immediate offsets from address computations with the inbounds flag: If the address computation does not leave the bounds of the allocated object, it cannot leave the bounds of the memory aperture and is therefore safe to handle with an immediate offset. Relevant tests are in fold-gep-offset.ll. Analogous to #132353 for SDAG (which is not yet in a mergeable state, its progress is currently blocked by #146076). Fixes SWDEV-516125 for GISel.
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