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ce2b45bd7d
From the linker's perspective, an available_externally global is equivalent to an external declaration (per isDeclarationForLinker()), so it is incorrect to consider it to be a weak definition. Also clean up some logic in the dead argument elimination pass and clarify its comments to better explain how its behavior depends on linkage, introduce GlobalValue::isStrongDefinitionForLinker() and start using it throughout the optimizers and backend. Differential Revision: http://reviews.llvm.org/D10941 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241413 91177308-0d34-0410-b5e6-96231b3b80d8