[NewPM][PassInstrumentation] IR printing support for (Thin)LTO

[NewPM][PassInstrumentation] IR printing support for (Thin)LTO

Summary: IR printing has not been correctly supported with (Thin)LTO if the new pass manager is enabled. Previously we only get outputs from backend(codegen) passes, as they are still under legacy pass manager even when the new pass manager is enabled. This patch addresses the issue and enables IR printing for optimization passes with new pass manager + (Thin)LTO setting.

Reviewers: fedor.sergeev, philip.pfaffe

Subscribers: mehdi_amini, inglorion, hiraditya, steven_wu, dexonsmith, dang, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66253

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369024 91177308-0d34-0410-b5e6-96231b3b80d8