[llvm] [X86][MC] Support encoding/decoding for APX variant ADD/SUB/ADC/SBB/OR/XOR instructions (PR #76319)

[Phoebe Wang via llvm-commits]

================
@@ -523,56 +606,200 @@ multiclass ArithBinOp_RF<bits<8> BaseOpc, bits<8> BaseOpc2, bits<8> BaseOpc4,
                          SDNode opnodeflag, SDNode opnode,
                          bit CommutableRR, bit ConvertibleToThreeAddress,
                          bit ConvertibleToThreeAddressRR> {
-  let Constraints = "$src1 = $dst" in {
-    let isCommutable = CommutableRR,
-        isConvertibleToThreeAddress = ConvertibleToThreeAddressRR in {
+  let isCommutable = CommutableRR,
+      isConvertibleToThreeAddress = ConvertibleToThreeAddressRR in {
----------------
phoebewang wrote:

I think LEA has other drawbacks more serious the code length, we should perfer NDD to LEA.

https://github.com/llvm/llvm-project/pull/76319