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bf06fa747d
Brings in RetroArch's "rchd: allocate nothing per hunk once an image is open" and "rchd: say how long lent bytes have to live". CHD reads no longer allocate once the image is open: the staging buffer is reused, the CD FLAC decoder is kept and rewound, and the hunk cache, CD sector scratch and FLAC rewind point are allocated at open. A malloc counter over every sector of CD LZMA, CD FLAC and mixed images went from 299 allocations during reads to 0.