[ThinLTO] Add an option to disable (thin)lto internalization.
Summary:
LTO and ThinLTO optimizes the IR differently.
One source of differences is the amount of internalizations that
can happen.
Add an option to enable/disable internalization so that other
differences can be studied in isolation. e.g. inlining.
There are other things lto and thinlto do differently, I will add
flags to enable/disable them as needed.
Reviewers: tejohnson, pcc, steven_wu
Subscribers: mehdi_amini, inglorion, steven_wu, dexonsmith, dang, llvm-commits
Differential Revision: https://reviews.llvm.org/D53294
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346140
91177308-0d34-0410-b5e6-
96231b3b80d8
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