[PATCH] [PassManager] add calls to RoundTrip{YAML, Native} Reader/Writer

[Shankar Kalpathi Easwaran]

  After more thought, I still want to go with a class for FileToMutable instead of a function. I will wait for the feedback from Michael on this if we want to change it to a function as Rui indicated in the review.


================
Comment at: include/lld/ReaderWriter/Simple.h:87
@@ +86,3 @@
+private:
+  const File &_file;
+};
----------------
Already removed.


http://llvm-reviews.chandlerc.com/D2047