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b2a0487ba4
This drops a GNU gold workaround and reverts the revert commit rL366708. Before binutils 2.34, gold -O2 and above did not correctly handle R_386_GOTOFF to SHF_MERGE|SHF_STRINGS sections: https://sourceware.org/bugzilla/show_bug.cgi?id=16794 From the original review: ... it reduced the size of a big ARM-32 debug image by 33%. It contained ~68M of relocations symbols out of total ~71M symbols (96% of symbols table was generated for relocations with symbol). -Wl,-O2 (and -Wl,-O3) is so rare that we should just lower the optimization level for LLVM_LINKER_IS_GOLD rather than pessimizing all users.
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