[PATCH] Add flags -Rpass-missed and -Rpass-analysis.

[Richard Smith]

LGTM, really sorry for the delay

================
Comment at: lib/CodeGen/CodeGenAction.cpp:225
@@ -226,1 +224,3 @@
+    /// \brief Specialized handlers for optimization remarks.
+    /// Note that these handler only accept remarks and they always handles
     /// them.
----------------
Should be "handlers", " handle "

http://reviews.llvm.org/D3683