export ReferencePathMatchResult interface as it is used by other exported functions

src/compiler/parser.ts

@@ -747,7 +747,7 @@ module ts {
         nodeIsNestedInLabel(label: Identifier, requireIterationStatement: boolean, stopAtFunctionBoundary: boolean): ControlBlockContext;
     }
 
-    interface ReferencePathMatchResult {
+    export interface ReferencePathMatchResult {
         fileReference?: FileReference
         diagnostic?: DiagnosticMessage
         isNoDefaultLib?: boolean