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The AMDGPU non-strict fdiv lowering needs to introduce an FP mode switch in some cases, and has custom nodes to provide chain/glue for the intermediate FP operations. We need to propagate nofpexcept here, but getNode was dropping the flags. Adding nofpexcept in the AMDGPU custom lowering is left to a future patch. Also fix a second case where flags were dropped, but in this case it seems it just didn't handle this number of operands. Test will be included in future AMDGPU patch.
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