Align beg address down instead of up in __asan_region_is_poisoned(), so the shadow scan includes the first granule. This fixes a false negative when first granule has an unpoisoned prefix and poisoned suffix. Add test that covers this scenario.
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================