[PATCH] D116931: [GlobalISel][Legalizer] Support big endian when reducing load/store width

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`LegalizerHelper::reduceLoadStoreWidth` uses little endian order when splitting. In order to support big endian, `SplitValueOffset` is added. It can calculates the offset in big or little endian order.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D116931

Files:
  llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
  llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  llvm/lib/Target/M68k/GISel/M68kLegalizerInfo.cpp
  llvm/test/CodeGen/M68k/GlobalISel/legalizer_load_store.ll

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