[Analysis] Fix a warning

This patch fixes:

  llvm/lib/Analysis/IR2Vec.cpp:296:2: error: extra ';' outside of a
  function is incompatible with C++98
  [-Werror,-Wc++98-compat-extra-semi]

Author: kazutakahirata

llvm/lib/Analysis/IR2Vec.cpp

@@ -293,7 +293,7 @@ Error IR2VecVocabAnalysis::parseVocabSection(
             "' section of the vocabulary are not of the same dimension");
 
   return Error::success();
-};
+}
 
 // FIXME: Make this optional. We can avoid file reads
 // by auto-generating a default vocabulary during the build time.