6. [10] The following C code is intended to count the number of 1s in the bit representation of x. However, some value(s) of x will cause an infinite loop: int popCount (int x) { int result = 0; do { result += x & 0x1; x >>= 1; } while (x); return result; } 0000 X= X 0001 Which value(s) of x will cause the code to loop infinitely? No need to list all of the values; please generalize instead and explain your answer: