fix: resolveDynamicComponent should use context instance

packages/compiler-core/__tests__/transforms/transformElement.spec.ts

@@ -788,7 +788,8 @@ describe('compiler: element transform', () => {
             {
               type: NodeTypes.SIMPLE_EXPRESSION,
               content: 'foo'
-            }
+            },
+            '$'
           ]
         }
       ])

packages/compiler-core/src/transforms/transformElement.ts

@@ -86,7 +86,8 @@ export const transformElement: NodeTransform = (node, context) => {
         else if (isProp.exp) {
           dynamicComponent = createCallExpression(
             context.helper(RESOLVE_DYNAMIC_COMPONENT),
-            [isProp.exp]
+            // _ctx.$ exposes the owner instance of current render function
+            [isProp.exp, context.prefixIdentifiers ? `_ctx.$` : `$`]
           )
         }
       }