Revert "Lex: Migrate HeaderSearch::LoadedModuleMaps to FileEntryRef"

This reverts commit a40db5502b2515a6f2f1676b5d7a655ae0f41179.
and follow-up d636b881bb9214938973098a012fad453082c444

Somewhat speculative, likely broke check-clang on Windows:
https://reviews.llvm.org/D92975#2453482

1 files changed, 3 insertions, 3 deletions

diff --git a/clang/lib/Frontend/FrontendAction.cpp b/clang/lib/Frontend/FrontendAction.cpp
index d3891eb..2317873 100644
--- a/clang/lib/Frontend/FrontendAction.cpp
+++ b/clang/lib/Frontend/FrontendAction.cpp
@@ -432,7 +432,7 @@ static bool loadModuleMapForModuleBuild(CompilerInstance &CI, bool IsSystem,
 
   // Map the current input to a file.
   FileID ModuleMapID = SrcMgr.getMainFileID();
-  Optional<FileEntryRef> ModuleMap = SrcMgr.getFileEntryRefForID(ModuleMapID);
+  const FileEntry *ModuleMap = SrcMgr.getFileEntryForID(ModuleMapID);
 
   // If the module map is preprocessed, handle the initial line marker;
   // line directives are not part of the module map syntax in general.
@@ -445,7 +445,7 @@ static bool loadModuleMapForModuleBuild(CompilerInstance &CI, bool IsSystem,
   }
 
   // Load the module map file.
-  if (HS.loadModuleMapFile(*ModuleMap, IsSystem, ModuleMapID, &Offset,
+  if (HS.loadModuleMapFile(ModuleMap, IsSystem, ModuleMapID, &Offset,
                            PresumedModuleMapFile))
     return true;
 
@@ -807,7 +807,7 @@ bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
 
   // If we were asked to load any module map files, do so now.
   for (const auto &Filename : CI.getFrontendOpts().ModuleMapFiles) {
-    if (auto File = CI.getFileManager().getOptionalFileRef(Filename))
+    if (auto File = CI.getFileManager().getFile(Filename))
       CI.getPreprocessor().getHeaderSearchInfo().loadModuleMapFile(
           *File, /*IsSystem*/false);
     else