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PR middle-end/41935 * c-common.c (fold_offsetof_1) <case ARRAY_REF>: Don't crash for VLAs or non-constant index, allow index one past the last element and allow exceeding array bound in arrays that might be used as flexible array members. * gcc.dg/pr41935.c: New test. * c-c++-common/pr41935.c: New test. * c-c++-common/builtin-offsetof.c (f0): Allow index one past the last element. * gcc.c-torture/execute/pr41935.c: New test. From-SVN: r153962
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