[PATCH] D154919: [LoongArch] Implement isSExtCheaperThanZExt

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Implement isSExtCheaperThanZExt.

Signed-off-by: WANG Rui <wangrui at loongson.cn>

Depends on D154918 <https://reviews.llvm.org/D154918>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154919

Files:
  llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
  llvm/lib/Target/LoongArch/LoongArchISelLowering.h
  llvm/test/CodeGen/LoongArch/atomicrmw-uinc-udec-wrap.ll
  llvm/test/CodeGen/LoongArch/duplicate-returns-for-tailcall.ll
  llvm/test/CodeGen/LoongArch/get-setcc-result-type.ll
  llvm/test/CodeGen/LoongArch/ir-instruction/atomic-cmpxchg.ll
  llvm/test/CodeGen/LoongArch/ir-instruction/br.ll
  llvm/test/CodeGen/LoongArch/jump-table.ll
  llvm/test/CodeGen/LoongArch/nomerge.ll
  llvm/test/CodeGen/LoongArch/sext-cheaper-than-zext.ll
  llvm/test/CodeGen/LoongArch/shrinkwrap.ll
  llvm/test/CodeGen/LoongArch/spill-ra-without-kill.ll
  llvm/test/CodeGen/LoongArch/tail-calls.ll

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