Given a following C program, where M and N are constant declared with #define long P[M][N]; long Q[N][M]; long sum_element (long i, long j) { return P[i][j] + Q[j][i]; } In compiling this program, gcc generates the following assembly code: long sum_element (long i, long j) sum_element: leaq 0 (,%rdi, 8), %rdx subq %rdi, %rdx addq %rsi, %rdx leaq (%rsi,%rsi, 4), %rax addq %rax, %rdi movq Q (,%rdi, 8), %rax addq P (,%rdx, 8), %rax ret What are the values of M and N?