Plugin final fusion check reports functions that do not exist in final core

[harendra-kumar]

We report:

fusion-plugin: Check unfused (final)...
In $sfoldOnce_spag binders ["$sgo_sqbe"] SCRUTINIZE data types annotated with Fuse
$sfoldOnce_spag/$sgo_sqbe: Yield
$sfoldOnce_spag/$sgo_sqbe: Partial

In lvl_sp7I binders ["lvl_sp7I"] CONSTRUCT data types annotated with Fuse
lvl_sp7I: Stop

In lvl_sp7J binders ["lvl_sp7J"] CONSTRUCT data types annotated with Fuse
lvl_sp7J: Yield

In lvl_sp7K binders ["lvl_sp7K"] CONSTRUCT data types annotated with Fuse
lvl_sp7K: Yield

In $w$stoStreamK_spVg binders ["go'_sp7P"] SCRUTINIZE data types annotated with Fuse
$w$stoStreamK_spVg/$wgo_spV7/go'_sp7P: Yield

In $sunfoldrM_sp2Y binders ["step_sp7Z"] CONSTRUCT data types annotated with Fuse
$sunfoldrM_sp2Y/step_sp7Z: Stop
$sunfoldrM_sp2Y/step_sp7Z: Yield

But none of these exist in the final core. These are perhaps dead/unreachable functions that get cleaned up in the final core. We should not be reporting these.