Fix a small bug in clang where generating some temporary files would have an extra period before the extension.

[dirty]

Summary

Fix a small bug in clang where generating some temporary files would have an extra period before the extension.

[akyrtzi]

Committed in r247160, thanks!

lib/ARCMigrate/FileRemapper.cpp

if (const FileEntry *FE = I->second.dyn_cast<const FileEntry *>()) {
       SmallString<200> newPath = StringRef(FE->getName());
       fs::make_absolute(newPath);
       infoOut << newPath << '\n';
     } else {
 
       SmallString<64> tempPath;
       int fd;
       if (fs::createTemporaryFile(path::filename(origFE->getName()),
-                                  path::extension(origFE->getName()), fd,
+                                  path::extension(origFE->getName()).drop_front(), fd,
                                   tempPath))
         return report("Could not create file: " + tempPath.str(), Diag);
 
       llvm::raw_fd_ostream newOut(fd, /*shouldClose=*/true);
       llvm::MemoryBuffer *mem = I->second.get<llvm::MemoryBuffer *>();
       newOut.write(mem->getBufferStart(), mem->getBufferSize());
       newOut.close();
       

lib/ARCMigrate/ObjCMT.cpp

static std::string applyEditsToTemp(const FileEntry *FE,
   const RewriteBuffer *Buf = rewriter.getRewriteBufferFor(FID);
   SmallString<512> NewText;
   llvm::raw_svector_ostream OS(NewText);
   Buf->write(OS);
 
   SmallString<64> TempPath;
   int FD;
   if (fs::createTemporaryFile(path::filename(FE->getName()),
-                              path::extension(FE->getName()), FD,
+                              path::extension(FE->getName()).drop_front(), FD,
                               TempPath)) {
     reportDiag("Could not create file: " + TempPath.str(), Diag);
     return std::string();
   }
 
   llvm::raw_fd_ostream TmpOut(FD, /*shouldClose=*/true);
   TmpOut.write(NewText.data(), NewText.size());
   TmpOut.close();

lib/Frontend/Rewrite/FrontendActions.cpp

public:
   }
 };
 
 class FixItRewriteToTemp : public FixItOptions {
 public:
   std::string RewriteFilename(const std::string &Filename, int &fd) override {
     SmallString<128> Path;
     llvm::sys::fs::createTemporaryFile(llvm::sys::path::filename(Filename),
-                                       llvm::sys::path::extension(Filename), fd,
+                                       llvm::sys::path::extension(Filename).drop_front(), fd,
                                        Path);
     return Path.str();
   }
 };
 } // end anonymous namespace
 
 bool FixItAction::BeginSourceFileAction(CompilerInstance &CI,
                                         StringRef Filename) {