[ThinLTO] Ensure anonymous globals renamed even at -O0
Summary:
This fixes an issue when files are compiled with -flto=thin
at default -O0. We need to rename anonymous globals before attempting
to write the module summary because all values need names for
the summary. This was happening at -O1 and above, but not before
the early exit when constructing the pipeline for -O0.
Also add an internal -prepare-for-thinlto option to enable this
to be tested via opt.
Fixes PR30419.
Reviewers: mehdi_amini
Subscribers: probinson, llvm-commits, mehdi_amini
Differential Revision: https://reviews.llvm.org/D24701
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281840
91177308-0d34-0410-b5e6-
96231b3b80d8
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