[LTO] Expose opt() in LTOBackend (NFC).
Exposing opt() which runs middle-end LTO optimzation allows re-using it
in LTOCodeGenerator.
Reviewed By: steven_wu
Differential Revision: https://reviews.llvm.org/D94486
[LTO] Expose opt() in LTOBackend (NFC). fhahn on Thu, Jan 14, 1:53 AM. Authored by Tags None Subscribers None
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