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In addition to target-dependent attributes, we can also preserve a white-listed subset of target independent function attributes. The white-list excludes problematic attributes, most prominently: * attributes related to memory accesses, as alloca instructions could be moved in/out of the extracted block * control-flow dependent attributes, like no_return or thunk, as the relerelevant instructions might or might not get extracted. Thanks @efriedma and @aemerson for providing a set of attributes that cannot be propagated. Reviewers: efriedma, davidxl, davide, silvas Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D41334 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321961 91177308-0d34-0410-b5e6-96231b3b80d8