Question 1 a. Write more efficient code consisting of two ARM assembly instructions that are equivalent to the following instruction sequence MOV r7, r7, ROR #5 SUB r7, r2, r7 MOV r8, r8, LSL #2 ADD r8, r2, r8 b. Write a single ARM assembly instruction which will multiply an integer stored in r10 by 17 and store the product in r4. (Note: you cannot use any of the explicit multiplication instructions; MLA, MUL, UMLAL UMULL, SMLAL, or SMULL)