OSV-2020-324 Heap-buffer-overflow in av1_convolve_2d_copy_sr_sse2

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12549 Crash type: Heap-buffer-overflow READ 16 Crash state: av1convolve2dcopysrsse2 av1convolve2dfacade av1makeinterpredictor...