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This fixes #401 by compensating for what is probably an LLVM bug in
copyAttributesFrom
which doesn't actually copy over thecomdat
attributes. Either that, or LLVM doesn't considercomdat
a traditional attribute. The actual fix here is a single line of code:newfn->setComdat(fn->getComdat());
. Everything else is either just to improve MSVC compatibility, or is the stdio workaround being removed from the tests.A separate bug may need to be filed upstream to LLVM.