Merge pull request microsoft#8447 from Microsoft/resetSymbolCount

reset symbol count in binder

Author: vladima

src/compiler/binder.ts

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