Remove unused defaulted argument `IncludeTextualHeaders`.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@239123 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Lex/ModuleMap.h

@@ -272,16 +272,11 @@ public:
   /// used from.  Used to disambiguate if a header is present in multiple
   /// modules.
   ///
-  /// \param IncludeTextualHeaders If \c true, also find textual headers. By
-  /// default, these are treated like excluded headers and result in no known
-  /// header being found.
-  ///
   /// \returns The module KnownHeader, which provides the module that owns the
   /// given header file.  The KnownHeader is default constructed to indicate
   /// that no module owns this header file.
   KnownHeader findModuleForHeader(const FileEntry *File,
-                                  Module *RequestingModule = nullptr,
-                                  bool IncludeTextualHeaders = false);
+                                  Module *RequestingModule = nullptr);
 
   /// \brief Reports errors if a module must not include a specific file.
   ///

lib/Lex/ModuleMap.cpp

@@ -332,12 +332,11 @@ static bool isBetterKnownHeader(const ModuleMap::KnownHeader &New,
 
 ModuleMap::KnownHeader
 ModuleMap::findModuleForHeader(const FileEntry *File,
-                               Module *RequestingModule,
-                               bool IncludeTextualHeaders) {
+                               Module *RequestingModule) {
   HeadersMap::iterator Known = findKnownHeader(File);
 
   auto MakeResult = [&](ModuleMap::KnownHeader R) -> ModuleMap::KnownHeader {
-    if (!IncludeTextualHeaders && (R.getRole() & ModuleMap::TextualHeader))
+    if (R.getRole() & ModuleMap::TextualHeader)
       return ModuleMap::KnownHeader();
     return R;
   };