Fix the order of destructors in LibLTOCodeGenerator

Fix the order of destructors in LibLTOCodeGenerator

Summary:
The order of destructors in LTOCodeGenerator gets changed in r254696.
It is possible for LTOCodeGenerator to have a MergedModule created in
the OwnedContext, in which case the module must be destructed before
the context.

Reviewers: rafael, dexonsmith

Subscribers: llvm-commits, joker.eph

Differential Revision: http://reviews.llvm.org/D15346

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255092 91177308-0d34-0410-b5e6-96231b3b80d8