Insert module constructors in a module pass

Insert module constructors in a module pass

Summary:
If we insert them from function pass some analysis may be missing or invalid.
Fixes PR42877.

Reviewers: eugenis, leonardchan

Reviewed By: leonardchan

Subscribers: hiraditya, cfe-commits, llvm-commits

Tags: #clang, #llvm

Differential Revision: https://reviews.llvm.org/D68832

llvm-svn: 374481
Signed-off-by: Vitaly Buka <vitalybuka@google.com>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374527 91177308-0d34-0410-b5e6-96231b3b80d8