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[llvm-link] fix linker behavior when linking archives with --only-needed option

Authored by sdmitriev on Jan 5 2021, 9:46 AM.

Description

[llvm-link] fix linker behavior when linking archives with --only-needed option

This patch fixes linker behavior when archive is linked with other inputs
as a library (i.e. when --only-needed option is specified). In this case library
is expected to be normally linked first into a separate module and only after
that linker should import required symbols from the linked library module.

Reviewed By: tra

Differential Revision: https://reviews.llvm.org/D92535