OpcodeDispatcher: note idea to further optimize rcl

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp

@@ -2618,6 +2618,7 @@ void OpDispatchBuilder::RCLOp1Bit(OpcodeArgs) {
   auto CF = GetRFLAG(FEXCore::X86State::RFLAG_CF_RAW_LOC);
 
   // Rotate left and insert CF in to lowest bit
+  // TODO: Use `adc Res, xzr, Dest, lsl 1` to save an instruction
   OrderedNode *Res = _Orlshl(OpSize, CF, Dest, 1);
 
   StoreResult(GPRClass, Op, Res, -1);