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https://discourse.llvm.org/t/parallel-input-file-parsing/60164 initializeSymbols currently sets Defined::section and handles non-prevailing COMDAT groups. Move the code to the parallel postParse to reduce work from the single-threading code path and make parallel section initialization infeasible. Postpone reporting duplicate symbol errors so that the messages have the section information. (`Defined::section` is assigned in postParse and another thread may not have the information). * duplicated-synthetic-sym.s: BinaryFile duplicate definition (very rare) now has no section information * comdat-binding: `%t/w.o %t/g.o` leads to an undesired undefined symbol. This is not ideal but we report a diagnostic to inform that this is unsupported. (See release note) * comdat-discarded-lazy.s: %tdef.o is unextracted. The new behavior (discarded section error) makes more sense * i386-comdat.s: switched to a better approach working around .gnu.linkonce.t.__x86.get_pc_thunk.bx in glibc<2.32 for x86-32. Drop the ancient no-longer-relevant workaround for __i686.get_pc_thunk.bx Depends on D120640 Differential Revision: https://reviews.llvm.org/D120626
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