Address review comments using StringRef

Author: mdtoguchi

clang/include/clang/Driver/Driver.h

@@ -692,12 +692,11 @@ class Driver {
 
   /// addIntegrationFiles - Add the integration files that will be populated
   /// by the device compilation and used by the host compile.
-  void addIntegrationFiles(const char *IntHeaderName,
-                           const std::string &FileName) const {
+  void addIntegrationFiles(StringRef IntHeaderName, StringRef FileName) const {
     IntegrationFileList.insert({FileName, IntHeaderName});
   }
   /// getIntegrationHeader - Get the integration header file
-  StringRef getIntegrationHeader(const std::string &FileName) const {
+  StringRef getIntegrationHeader(StringRef FileName) const {
     return IntegrationFileList[FileName];
   }
 };

clang/lib/Driver/Driver.cpp

@@ -5116,7 +5116,7 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
       std::string SrcFileName(I.second->getAsString(Args));
       std::string TmpFileNameHeader = C.getDriver().GetTemporaryPath(
           llvm::sys::path::stem(SrcFileName + "-header"), "h");
-      const char *TmpFileHeader =
+      StringRef TmpFileHeader =
           C.addTempFile(C.getArgs().MakeArgString(TmpFileNameHeader));
       addIntegrationFiles(TmpFileHeader, SrcFileName);
     }