completion for return const assertion. (microsoft#41475)

Author: ShuiRuTian

src/compiler/checker.ts

@@ -24423,10 +24423,7 @@ namespace ts {
             return undefined;
 
             function tryFindWhenConstTypeReference(node: Expression) {
-                if(isCallLikeExpression(node.parent)){
-                    return getContextualTypeForArgument(node.parent, node);
-                }
-                return undefined;
+                return getContextualType(node);
             }
         }
 

tests/cases/fourslash/completionReturnConstAssertion.ts

@@ -0,0 +1,17 @@
+/// <reference path="fourslash.ts" />
+
+
+//// type T = {
+////     foo1: 1;
+////     foo2: 2;
+//// }
+//// function F(x: ()=>T) {}
+//// F(()=>({/*1*/} as const))
+
+verify.completions({
+    marker: "1",
+    exact: [
+        { name: "foo1", text: "(property) foo1: 1" },
+        { name: "foo2", text: "(property) foo2: 2" },
+    ],
+});