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PR sanitizer/88291 * asan.c (asan_clear_shadow): Move assert that len is multiple of 4 to the start of the function. (asan_emit_stack_protection): When emitting clearing sequence for epilogue, align offset down to ASAN_RED_ZONE_SIZE granularity, add last_size_aligned which is last_size padded to multiples of ASAN_RED_ZONE_SIZE and emit asan_clear_shadow always on 4 byte boundaries. * c-c++-common/asan/pr88291.c: New test. From-SVN: r266721
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