BUG: Fix numba DUFuncs added loops getting picked up #21139
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It was always my intention to do this: If no loop is found and we go into the legacy ufunc path and legacy resolving works, we need to double check that the ufunc was not mutated. Normal operation never mutates ufuncs (its really not meant to be) but numbas DUFuncs need to do it (they compile loops dynamically). The future is much brighter for them in this regard, but right now they have to keep working. Closes numpygh-20735
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Backport of #21113.
It was always my intention to do this: If no loop is found and we
go into the legacy ufunc path and legacy resolving works, we need
to double check that the ufunc was not mutated.
Normal operation never mutates ufuncs (its really not meant to be)
but numbas DUFuncs need to do it (they compile loops dynamically).
The future is much brighter for them in this regard, but right now
they have to keep working.
Closes gh-20735