[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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340872 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed