Allow using memInventory with nonmoving gc
memInventory is helpful for diagnosing fragmentation, but it's currently disabled when the nonmoving gc is enabled as explained by this comment:
// Can't easily do a memory inventory: We might race with the nonmoving // collector. In principle we could try to take nonmoving_collection_mutex // and do an inventory if we have it but we don't currently implement this.
It also suggests a solution -- only taking an inventory if we can grab the nonmoving_collection_mutex.
I'll try to implement this suggestion.
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