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[llvm-objcopy][MachO] Add support for universal binaries

Authored by alexshap on Oct 6 2020, 3:41 AM.

Description

[llvm-objcopy][MachO] Add support for universal binaries

This diff adds support for universal binaries to llvm-objcopy.
This is a recommit of 32c8435ef70031 with the asan issue fixed.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D88400