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This adds a script which can be used to transform linker command lines
that use thin archives into invocations that use the object files
referred to from those thin archives. This can be used to debug linker
issues, particularly in ThinLTO builds.

BUG=877722
R=hans,rnk

Change-Id: Ibdebd1c92c85122f7705d68fa9ac46abfe6f3d13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954537Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Bob Haarman <inglorion@chromium.org>
Auto-Submit: Bob Haarman <inglorion@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722557}