[llvm] [llvm-objcopy] Support SREC output format (PR #75874)

[Fangrui Song via llvm-commits]

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+# FIXME: Currently the sections in this file are ignored and we
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MaskRay wrote:

Tests from the original ihex patch (https://reviews.llvm.org/D60270) may be useful.

https://github.com/llvm/llvm-project/pull/75874