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[MC] Change ELFOSABI_NONE to ELFOSABI_GNU for SHF_GNU_RETAIN
GNU ld does not give SHF_GNU_RETAIN GC root semantics for ELFOSABI_NONE. (https://sourceware.org/pipermail/binutils/2021-March/115581.html) This allows GNU ld to interpret SHF_GNU_RETAIN and avoids a gold quirk https://sourceware.org/bugzilla/show_bug.cgi?id=27490 Because ELFObjectWriter is in an anonymous namespace, I have to place `markGnuAbi` in the parent MCObjectWriter. Differential Revision: https://reviews.llvm.org/D97976
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