Undefine correct macro

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97920 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Frontend/PCHReader.cpp

@@ -120,7 +120,7 @@ PCHValidator::ReadLanguageOptions(const LangOptions &LangOpts) {
   PARSE_LANGOPT_IMPORTANT(OpenCL, diag::warn_pch_opencl);
   PARSE_LANGOPT_BENIGN(CatchUndefined);
   PARSE_LANGOPT_IMPORTANT(ElideConstructors, diag::warn_pch_elide_constructors);
-#undef PARSE_LANGOPT_IRRELEVANT
+#undef PARSE_LANGOPT_IMPORTANT
 #undef PARSE_LANGOPT_BENIGN
 
   return false;