[clangd] Fix filename ranges while replaying preamble

[kadircet]

Summary

Clangd used first token of filename as filename range rather than the
synthezied filename token. Unfortunately the former only contains " or < in
the raw lexing mode, resulting in wrong range information and breaking tidy
checks that relied on it.

Fixes https://github.com/clangd/clangd/issues/896.

[sammccall]

Wow, nice find!

clang-tools-extra/clangd/ParsedAST.cpp

for (const auto &Inc : Includes) {
       // quotes/angles.
       SynthesizedFilenameTok.setLength(Inc.Written.length());
       SynthesizedFilenameTok.setKind(tok::header_name);
       SynthesizedFilenameTok.setLiteralData(Inc.Written.data());
 
       const FileEntry *FE = File ? &File->getFileEntry() : nullptr;
       llvm::StringRef WrittenFilename =
           llvm::StringRef(Inc.Written).drop_front().drop_back();
-      Delegate->InclusionDirective(HashTok->location(), SynthesizedIncludeTok,
-                                   WrittenFilename, Inc.Written.front() == '<',
-                                   FileTok->range(SM).toCharRange(SM), FE,
-                                   "SearchPath", "RelPath",
-                                   /*Imported=*/nullptr, Inc.FileKind);
+      Delegate->InclusionDirective(
+          HashTok->location(), SynthesizedIncludeTok, WrittenFilename,
+          Inc.Written.front() == '<',
+          syntax::FileRange(SM, SynthesizedFilenameTok.getLocation(),
+                            SynthesizedFilenameTok.getEndLoc())
+              .toCharRange(SM),
+          FE, "SearchPath", "RelPath",
       if (File)
         Delegate->FileSkipped(*File, SynthesizedFilenameTok, Inc.FileKind);
       else {
         llvm::SmallString<1> UnusedRecovery;
         Delegate->FileNotFound(WrittenFilename, UnusedRecovery);
       }
     }
   }

clang-tools-extra/clangd/unittests/ParsedASTTests.cpp

 TEST(ParsedASTTest, ReplayPreambleForTidyCheckers) {
   struct Inclusion {
     Inclusion(const SourceManager &SM, SourceLocation HashLoc,
               const Token &IncludeTok, llvm::StringRef FileName, bool IsAngled,
               CharSourceRange FilenameRange)
         : HashOffset(SM.getDecomposedLoc(HashLoc).second), IncTok(IncludeTok),
           IncDirective(IncludeTok.getIdentifierInfo()->getName()),
           FileNameOffset(SM.getDecomposedLoc(FilenameRange.getBegin()).second),
-          FileName(FileName), IsAngled(IsAngled) {}
+          FileName(FileName), IsAngled(IsAngled) {
+      EXPECT_EQ(
+          toSourceCode(SM, FilenameRange.getAsRange()).drop_back().drop_front(),
+          FileName);
+    }
     size_t HashOffset;
     syntax::Token IncTok;
     llvm::StringRef IncDirective;
     size_t FileNameOffset;
     llvm::StringRef FileName;
     bool IsAngled;
   };
   static std::vector<Inclusion> Includes;