FEXCore: Implement xsaveopt

It's the same as xsave because we don't track a hidden "xinuse" hardware
mask. So this is a trivial implementation.

FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp

@@ -4682,8 +4682,7 @@ void OpDispatchBuilder::MemFenceOrXSAVEOPT(OpcodeArgs) {
     // 0xF0 is MFENCE
     _Fence(FEXCore::IR::Fence_LoadStore);
   } else {
-    LogMan::Msg::EFmt("Application tried using XSAVEOPT");
-    UnimplementedOp(Op);
+    XSaveOp(Op);
   }
 }