[llvm] [IR][DAG] Add support for `nneg` flag with `uitofp` (PR #86141)

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Thu Mar 21 23:36:31 PDT 2024

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goldsteinn wrote:

> [MachineInstr](https://llvm.org/doxygen/classllvm_1_1MachineInstr.html) and `MachineInstr::copyFlagsFromInstruction` will eventually need to support the nneg flag.

Surprised that wasn't added in when zext nneg support was added. @topperc any reason?

https://github.com/llvm/llvm-project/pull/86141

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