refactor: use FunctionParent on visiting var scope (#13152)

packages/babel-helper-hoist-variables/src/index.ts

@@ -19,7 +19,7 @@ const visitor = {
     if (state.kind === "let") path.skip();
   },
 
-  Function(path: NodePath) {
+  FunctionParent(path: NodePath) {
     path.skip();
   },
 

packages/babel-plugin-transform-block-scoping/src/index.js

@@ -175,7 +175,7 @@ const letReferenceBlockVisitor = traverse.visitors.merge([
         state.loopDepth--;
       },
     },
-    Function(path, state) {
+    FunctionParent(path, state) {
       // References to block-scoped variables only require added closures if it's
       // possible for the code to run more than once -- otherwise it is safe to
       // simply rename the variables.