Fix missing arguments in tutorial

[MCSH]

Summary

In tutorial "8. Kaleidoscope: Compiling to Object Code" a call to TargetMachine->addPassesToEmitFile(pass, dest, FileType) is missing nullptr as its 3rd value.

[hans]

Thanks! This matches the code in llvm/examples/Kaleidoscope/Chapter8/toy.cpp

Do you have commit access, or would you like me to commit it for you?

[MCSH]

I don't think I have access. Would you please take care of it?

Thanks in advance

trunk/docs/tutorial/LangImpl08.rst

 Finally, we define a pass that emits object code, then we run that
 pass:
 
 .. code-block:: c++
 
   legacy::PassManager pass;
   auto FileType = TargetMachine::CGFT_ObjectFile;
 
-  if (TargetMachine->addPassesToEmitFile(pass, dest, FileType)) {
+  if (TargetMachine->addPassesToEmitFile(pass, dest, nullptr, FileType)) {
     errs() << "TargetMachine can't emit a file of this type";
     return 1;
   }
 
   pass.run(*TheModule);
   dest.flush();
 
 Putting It All Together