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It looks like there are two versions of LowerCallTo here: the SelectionDAGBuilder one is designed to operate on LLVM IR, and the TargetLowering one in the case where everything is at DAG level. Previously, only the SelectionDAGBuilder variant could handle demoting an impossible return to sret semantics (before delegating to the TargetLowering version), but this functionality is also useful for certain libcalls (e.g. 128-bit operations on 32-bit x86). So this commit moves the sret handling down a level. rdar://problem/17242889 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211155 91177308-0d34-0410-b5e6-96231b3b80d8
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