GenASM: Set the bytesToClearFromStack variable earlier

If you set the variable after visiting the function body all children will see bytesToClearFromStack == 0.

src/main/java/de/hsrm/compiler/Klang/visitors/GenASM.java

@@ -660,17 +660,17 @@ public class GenASM implements Visitor<Void> {
       asm.sub("q", "$8", "%rsp");
     }
 
-    e.block.welcome(this);
-
     // I need to clear the stack here so that the top most element is the old rbp that
-    // ret uses to return to the caller but code that gets generated here will never be
-    // reached since the block node is guaranteed to contain a return node that results
-    // in a ret command being executed before this code would be reached.
-    // As a workaround (and a dirty, dirty hack) I indicate to the return node visitor
-    // how many bytes need to be cleared from the stack.
+    // ret uses to return to the caller but code that gets generated after visiting the
+    // function body will never be reached since the block node is guaranteed to
+    // contain a return node that results in a ret command being executed before this
+    // code would be reached. As a workaround (and a dirty, dirty hack) I indicate
+    // to the return node visitor how many bytes need to be cleared from the stack.
     var wasStackPadded = (registerParameters.size() + e.localVariables.length) % 2 != 0;
     bytesToClearFromTheStack = 8L * (registerParameters.size() + e.localVariables.length + (wasStackPadded ? 1 : 0));
 
+    e.block.welcome(this);
+
     return null;
   }