[llvm-commits] [patch][pr12606] Discard unused linkonce globals in globalopt

[Rafael Espíndola]

GlobalDCE already removes linkonce globals, but we don't run it at
-O2. The attached patch factors a bit of logic and changes globalopt
to also discard unused linkonce globals.

This is not enough to fix pr12606, but should be a step in the right
direction. Is it OK?

Cheers,
Rafael
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