[flang] Convert all messages to MessageTexts ("..."_msg).

Original-commit: flang-compiler/f18@33357f3657a6fea91af8cf8b5fd30b4be9efcdd0
Reviewed-on: https://github.com/flang-compiler/f18/pull/14
Tree-same-pre-rewrite: false
diff --git a/flang/lib/parser/preprocessor.h b/flang/lib/parser/preprocessor.h
index add74d6..8872761 100644
--- a/flang/lib/parser/preprocessor.h
+++ b/flang/lib/parser/preprocessor.h
@@ -74,8 +74,7 @@
   CharPointerWithLength SaveTokenAsName(const CharPointerWithLength &);
   bool IsNameDefined(const CharPointerWithLength &);
   TokenSequence ReplaceMacros(const TokenSequence &, const Prescanner &);
-  bool SkipDisabledConditionalCode(
-      const std::string &dirName, IsElseActive, Prescanner *);
+  bool SkipDisabledConditionalCode(const std::string &, IsElseActive, Prescanner *);
   bool IsIfPredicateTrue(
       const TokenSequence &expr, size_t first, size_t exprTokens, Prescanner *);