[PATCH] D140869: [TypePromotion] Add truncate in ConvertTruncs when the original truncate type is not extend type

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If the src type is not extend type, after convert the truncate to and we need to truncate the and also to make sure the all user is legal.

Fix: #59554


https://reviews.llvm.org/D140869

Files:
  llvm/lib/CodeGen/TypePromotion.cpp
  llvm/test/Transforms/TypePromotion/AArch64/pr58843.ll
  llvm/test/Transforms/TypePromotion/AArch64/trunc-zext-chain.ll

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