[clang-tidy] [modernize-use-auto] Get only a length of token, not the token itself

llvm-svn: 329873

clang-tools-extra/clang-tidy/modernize/UseAutoCheck.cpp

@@ -11,6 +11,7 @@
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/Lex/Lexer.h"
 #include "clang/Tooling/FixIt.h"
 
 using namespace clang;
@@ -419,8 +420,8 @@ void UseAutoCheck::replaceExpr(
   SourceRange Range(Loc.getSourceRange());
 
   if (MinTypeNameLength != 0 &&
-      tooling::fixit::getText(Loc.getSourceRange(), FirstDecl->getASTContext())
-              .size() < MinTypeNameLength)
+      Lexer::MeasureTokenLength(Loc.getLocStart(), Context->getSourceManager(),
+                                getLangOpts()) < MinTypeNameLength)
     return;
 
   auto Diag = diag(Range.getBegin(), Message);