[analyzer] Show element count in ArrayBound underflow reports (#158639) The underflow reports of checker security.ArrayBound previously displayed the (negative) byte offset of the accessed location; but those numbers were a bit hard to decipher (especially when the elements were large structs), so this commit replaces the byte offset with an index value (if the offset is an integer multiple of the size of the accessed element). This change only affects the content of the messages; the checker will find the same issues before and after this commit.
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