Lunderberg opened a new pull request, #16843:
URL: https://github.com/apache/tvm/pull/16843

   Prior to this commit, `ApplyPassToFunction` removed functions from the 
`IRModule` to hide them from the inner `ir.transform.Pass`.  The dangling 
`GlobalVar` references to those functions meant that the intermediate 
`IRModule` was ill-formed This commit updates the `ApplyPassToFunction` utility 
to instead replace the functions with `ExternFunc` nodes.  This still prevents 
the inner `ir.transform.Pass` from having visibility into functions that should 
not be mutated, but provides a well-formed `IRModule`.


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