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driver: don't actually merge objects when ar -L works

Cheng Shao requested to merge TerrorJack/ghc:dont-merge-obj-when-ar-L-works into master

When ar -qL works, we can simply call ar to produce an archive whose objects will be properly added to the final archive. This is cheaper than actually invoking ld -r and should speed up building profile libs when AR=llvm-ar. Also crucial for !7632 (closed).

Edited by Cheng Shao

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