[NFC][ELF] Move mergeRels/partitionRels into finalizeContents#171203

jrtc27 wants to merge 1 commit intousers/jrtc27/spr/main.nfcelf-move-mergerelspartitionrels-into-finalizecontentsllvm/llvm-project:users/jrtc27/spr/main.nfcelf-move-mergerelspartitionrels-into-finalizecontentsfrom

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