[NFC][PassTiming] factor out generic PassTimingInfo

Moving PassTimingInfo from legacy pass manager code into a separate header.
Making it suitable for both legacy and new pass manager.
Adding a test on -time-passes main functionality.

llvm-svn: 340872
diff --git a/llvm/lib/Analysis/CallGraphSCCPass.cpp b/llvm/lib/Analysis/CallGraphSCCPass.cpp
index 4c33c42..df65255 100644
--- a/llvm/lib/Analysis/CallGraphSCCPass.cpp
+++ b/llvm/lib/Analysis/CallGraphSCCPass.cpp
@@ -27,6 +27,7 @@
 #include "llvm/IR/LegacyPassManagers.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/OptBisect.h"
+#include "llvm/IR/PassTimingInfo.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"