Merge pull request #8447 from Microsoft/resetSymbolCount

reset symbol count in binder

src/compiler/binder.ts

@@ -138,6 +138,7 @@ namespace ts {
             languageVersion = getEmitScriptTarget(options);
             inStrictMode = !!file.externalModuleIndicator;
             classifiableNames = {};
+            symbolCount = 0;
 
             Symbol = objectAllocator.getSymbolConstructor();