[NewPassManager] Adding pass tuning options: loop vectorize.

Summary:
Trying to add the plumbing necessary to add tuning options to the new pass manager.
Testing with the flags for loop vectorize.

Reviewers: chandlerc

Subscribers: sanjoy, mehdi_amini, jlebar, steven_wu, dexonsmith, dang, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59723

llvm-svn: 358763
diff --git a/llvm/lib/LTO/LTOBackend.cpp b/llvm/lib/LTO/LTOBackend.cpp
index 64c5969..9c2d0ed 100644
--- a/llvm/lib/LTO/LTOBackend.cpp
+++ b/llvm/lib/LTO/LTOBackend.cpp
@@ -164,7 +164,7 @@
                         PGOOptions::IRUse, PGOOptions::CSIRUse);
   }
 
-  PassBuilder PB(TM, PGOOpt);
+  PassBuilder PB(TM, PipelineTuningOptions(), PGOOpt);
   AAManager AA;
 
   // Parse a custom AA pipeline if asked to.