getSymbolAtLocation now returns symbol for external modules

Author: vladima

src/compiler/checker.ts

@@ -16587,6 +16587,9 @@ namespace ts {
  }
 
  function getSymbolAtLocation(node: Node) {
+ if (node.kind === SyntaxKind.SourceFile) {
+ return isExternalModule(<SourceFile>node) ? getMergedSymbol(node.symbol) : undefined;
+ }
  if (isInsideWithStatementBody(node)) {
  // We cannot answer semantic questions within a with block, do not proceed any further
  return undefined;