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In copying GC, with the relevant debug flags enabled, we release the old blocks after a GC, and the block allocator zeroes the space before releasing a block. This effectively zeros the old heap. In compacting GC we reuse the blocks and previously we didn't zero the unused space in a compacting generation after compaction. With this patch we zero the slop between the free pointer and the end of the block when we're done with compaction and when switching to a new block (because the current block doesn't have enough space for the next object we're shifting).
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