Initial file

HUGE-OBJ-NOTES

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+Notes for work to do on this branch:
+
+- add constant for max size obj on stack (maybe limit * 2?)
+- make vector - alloc on heap if size of elements > max size limit
+  (need to make this function as potentially blocking? probably, but maybe leave a TODO for now)
+- add heap type ID to heap struct
+- add a huge obj heap
+  - this heap will only allocate objects of size >= max stack obj size
+  - make sure to allocate obj size + alignment
+  - each page is just one obj, will free page when obj is freed (as part of sweep)
+- initially, work will allow the gcbench from larceny to work