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Raymond Toy authored
In gc_free_heap, the check that unallocated pages are zero can only be done if gencgc_unmap_zero is MODE_MAP or MODE_MEMSET. The other modes are known not to zero memory. Also, don't limit the check to the first 16K pages, and also check the entire page of GC_PAGE_SIZE bytes, not just the first 1024 words.
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