Adding block metadata facilities into the GC package #17073
Merged
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These facilities will be used by GCs to record array metadata and finalizer data into blocks.
These are moved from rt.lifetime, so the GC can take over. In a future PR, the API will move to the GC itself, so a GC could use any mechanism it wishes for these.
See the master plan for the new GC: schveiguy#8
This is split into 2 commits -- one is the copy/paste of the functions as-is (no changes to the code), and the second is a modification of the code so I could combine two separate functions that were nearly identical.