[New PM][PassInstrumentation] IR printing support for New Pass Manager

Implementing -print-before-all/-print-after-all/-filter-print-func support
through PassInstrumentation callbacks.

- PrintIR routines implement printing callbacks.

- StandardInstrumentations class provides a central place to manage all
  the "standard" in-tree pass instrumentations. Currently it registers
  PrintIR callbacks.

Reviewers: chandlerc, paquette, philip.pfaffe
Differential Revision: https://reviews.llvm.org/D50923

llvm-svn: 342896