[RISCV] Update comments in RISCVMatInt to reflect we don't always use ADDIW after LUI now. NFC (#159829) The simm32 base case only uses lui+addiw when necessary after 3d2650bdeb8409563d917d8eef70b906323524ef The worst case 8 instruction sequence doesn't leave a full 32 bits for the LUI+ADDI(W) after the 3 12-bit ADDI and SLLI pairs are created. So we will never generate LUI+ADDIW in the worst case sequence.
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