[llvm-dev] What can cause llc to throw an error for instruction numbering?

[Kaarthik Alagapan via llvm-dev]

I duplicated an instruction in llvm and changed its opcode by following the guide at https://llvm.org/docs/ExtendingLLVM.html (Adding a new instruction) and then fixed the dependencies that caused an error when building. Now the modified llvm builds but throws but now throws the error:
llc: error: llc: check.ll:12:3: error: instruction expected to be numbered '%5'

  %4 = alloca i32, align 4

What changes/modification would cause this error to show up? I was thinking that SelectionDAGBuilder would cause this as it parses IR to an optimized version but not sure.

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