[Frontend] Clean up some dead code in PrecompiledPreamble. NFC

clang/include/clang/Frontend/PrecompiledPreamble.h

@@ -134,14 +134,6 @@ private:
     // A main method used to construct TempPCHFile.
     static llvm::ErrorOr<TempPCHFile> CreateNewPreamblePCHFile();
 
-    /// Call llvm::sys::fs::createTemporaryFile to create a new temporary file.
-    static llvm::ErrorOr<TempPCHFile> createInSystemTempDir(const Twine &Prefix,
-                                                            StringRef Suffix);
-    /// Create a new instance of TemporaryFile for file at \p Path. Use with
-    /// extreme caution, there's an assertion checking that there's only a
-    /// single instance of TempPCHFile alive for each path.
-    static llvm::ErrorOr<TempPCHFile> createFromCustomPath(const Twine &Path);
-
   private:
     TempPCHFile(std::string FilePath);
 

clang/lib/Frontend/PrecompiledPreamble.cpp

@@ -535,21 +535,15 @@ PrecompiledPreamble::TempPCHFile::CreateNewPreamblePCHFile() {
   // FIXME: This is a hack so that we can override the preamble file during
   // crash-recovery testing, which is the only case where the preamble files
   // are not necessarily cleaned up.
-  const char *TmpFile = ::getenv("CINDEXTEST_PREAMBLE_FILE");
-  if (TmpFile)
-    return TempPCHFile::createFromCustomPath(TmpFile);
-  return TempPCHFile::createInSystemTempDir("preamble", "pch");
-}
+  if (const char *TmpFile = ::getenv("CINDEXTEST_PREAMBLE_FILE"))
+    return TempPCHFile(TmpFile);
 
-llvm::ErrorOr<PrecompiledPreamble::TempPCHFile>
-PrecompiledPreamble::TempPCHFile::createInSystemTempDir(const Twine &Prefix,
-                                                        StringRef Suffix) {
   llvm::SmallString<64> File;
   // Using a version of createTemporaryFile with a file descriptor guarantees
   // that we would never get a race condition in a multi-threaded setting
   // (i.e., multiple threads getting the same temporary path).
   int FD;
-  auto EC = llvm::sys::fs::createTemporaryFile(Prefix, Suffix, FD, File);
+  auto EC = llvm::sys::fs::createTemporaryFile("preamble", "pch", FD, File);
   if (EC)
     return EC;
   // We only needed to make sure the file exists, close the file right away.
@@ -557,11 +551,6 @@ PrecompiledPreamble::TempPCHFile::createInSystemTempDir(const Twine &Prefix,
   return TempPCHFile(std::move(File).str());
 }
 
-llvm::ErrorOr<PrecompiledPreamble::TempPCHFile>
-PrecompiledPreamble::TempPCHFile::createFromCustomPath(const Twine &Path) {
-  return TempPCHFile(Path.str());
-}
-
 PrecompiledPreamble::TempPCHFile::TempPCHFile(std::string FilePath)
     : FilePath(std::move(FilePath)) {
   TemporaryFiles::getInstance().addFile(*this->FilePath);