[llvm] [RISCV][NFC] Use NFList in NFSet (PR #67517)

[Michael Maitland via llvm-commits]

================
@@ -219,10 +219,8 @@ defvar FPListW = [SCALAR_F16, SCALAR_F32];
 defvar BFPListW = [SCALAR_BF16];
 
 class NFSet<LMULInfo m> {
-  list<int> L = !cond(!eq(m.value, V_M8.value): [],
-                      !eq(m.value, V_M4.value): [2],
-                      !eq(m.value, V_M2.value): [2, 3, 4],
-                      true: [2, 3, 4, 5, 6, 7, 8]);
+  defvar lmul = !shl(1, m.value);
----------------
michaelmaitland wrote:

Actually, I think fractional will just take on 0b000 since it’s a 3 bit value. Still fine with me. 

https://github.com/llvm/llvm-project/pull/67517