[PATCH] D88213: [llvm-objcopy][NFC] refactor error handling. part 2.

[Alexey Lapshin via Phabricator via llvm-commits]

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Remove usages of special error reporting functions(error(),
reportError()). This patch is extracted from D87987 <https://reviews.llvm.org/D87987>.
Errors are reported as Expected<>/Error returning values.
This part is for COFF subfolder of llvm-objcopy.

Testing: check-all.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88213

Files:
  llvm/tools/llvm-objcopy/COFF/COFFObjcopy.cpp
  llvm/tools/llvm-objcopy/COFF/Object.cpp
  llvm/tools/llvm-objcopy/COFF/Object.h

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