[PGO][PGSO] SizeOpts changes.
Summary:
(Split of off D67120)
SizeOpts/MachineSizeOpts changes for profile guided size optimization.
Reviewers: davidxl
Subscribers: mgorny, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69070
llvm-svn: 375254