[NewPM] Add callbacks to PassBuilder to run before/after parsing a pass

This is in preparation for supporting -debugify-each, which adds a debug
info pass before and after each pass.

Switch VerifyEach to use this.

Reviewed By: ychen

Differential Revision: https://reviews.llvm.org/D88107

GitOrigin-RevId: 111aa4e36614d9a056cf5040d4d7bbfddeb9ebb2
1 file changed