[AMDGPU] Remove special cases in TTI::getMemcpyLoop(Residual)LoweringType (#125507) These special cases limit the width of memory operations we use for lowering memcpy/memmove when the pointer arguments are 2-aligned or in the LDS/GDS. I found that performance in microbenchmarks on gfx90a, gfx1030, and gfx1100 is better without this limitation.
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