Address comments from ellishg

Author: kyulee-com

llvm/include/llvm/CGData/CodeGenData.h

@@ -164,13 +164,14 @@ publishOutlinedHashTree(std::unique_ptr<OutlinedHashTree> HashTree) {
   CodeGenData::getInstance().publishOutlinedHashTree(std::move(HashTree));
 }
 
-/// Initialize the two-codegen rounds.
 void initializeTwoCodegenRounds();
 
-/// Save the current module before the first codegen round.
+/// Save \p TheModule before the first codegen round.
+/// \p Task represents the partition number in the parallel code generation
+/// process.
 void saveModuleForTwoRounds(const Module &TheModule, unsigned Task);
 
-/// Load the current module before the second codegen round.
+/// Load the optimized module before the second codegen round.
 std::unique_ptr<Module> loadModuleForTwoRounds(BitcodeModule &OrigModule,
                                                unsigned Task,
                                                LLVMContext &Context);

llvm/lib/CGData/CodeGenData.cpp

@@ -225,7 +225,9 @@ void warn(Error E, StringRef Whence) {
 }
 
 static std::string getPath(StringRef Dir, unsigned Task) {
-  return (Dir + "/" + llvm::Twine(Task) + ".saved_copy.bc").str();
+  llvm::SmallString<128> Path(Dir);
+  llvm::sys::path::append(Path, llvm::Twine(Task) + ".saved_copy.bc");
+  return std::string(Path);
 }
 
 void initializeTwoCodegenRounds() {