message: refactor(ngcc): avoid returning the same top-level helper calls multiple times
  This change should not have any impact on the code's behavior (based on
  how the function is currently used), but it will avoid unnecessary work.
  PR Close
diff: @@ -95,7 +95,7 @@ export class CommonJsReflectionHost extends Esm5ReflectionHost {
  const helperCallsMap = getOrDefault(this.topLevelHelperCalls, helperName, () => new Map());
  calls.push(...getOrDefault(
  helperCallsMap, sourceFile,
  - () => sourceFile.statements.map(statement => this.getHelperCall(statement, helperNames))
  + () => sourceFile.statements.map(statement => this.getHelperCall(statement, [helperName]))
  .filter(isDefined)));
  });
  return calls;
  