fix: alignment issue with stack in read

src/main/wacc/backend/asmGenerator.scala

@@ -92,10 +92,12 @@ object asmGenerator {
         labelGenerator.getLabel(Builtin.Read),
         List(
           stack.align(),
+          stack.reserve(),
           stack.push(RSI),
           Load(RSI, stack.head),
           assemblyIR.Call(CLibFunc.Scanf),
-          stack.pop(RAX)
+          stack.pop(RAX),
+          stack.drop()
         )
       )
   }