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324b3fc7c8
The infrastructure mimics the call lowering we have already in place for SelectionDAG, but with limitations. For example structure return demotion and non-simple types are not supported (yet). Currently every backend has its own implementation and duplicated code for call lowering. There is also no specified interface that could be called from target-independent code. The target-hook is opt-in and doesn't affect current implementations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212848 91177308-0d34-0410-b5e6-96231b3b80d8
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