fixed bug with memrchr(NULL, c, 0) #626
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Fixed behavior of
memrchrwhenptrandsizeare both zero (memrchr(NULL, ch, 0)).It returns the correct result in all cases except when
ptr + (nonzero_size - 1)overflows/wraps-around (such asmemrchr(0xFFFFFF, ch, 2)). Since pointer wrap-around is UB (Undefined behavior), I assume this is okay. Fixing the pointer wrap-around case costs 1 byte + 1F.