Crashless reproducers currently emit an extra anchor op in the pipeline
they print out, because one gets added by `appendReproducer`. Fix this
by always adding the anchor op in the caller of `appendReproducer`.
In addition, `mlir-opt` always uses `any` as the anchor op, instead of
getting the anchor op from the `PassManager`, fix that as well so we can
test that the pipeline is reproduced as it was passed in.
cb6c195de7