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Local ThinLTO defaults to emitting data objects and functions in
dedicated sections to facilitate dead stripping. This change adds
the same behavior to the distributed ThinLTO scripts.

BUG=1078453
TEST=tools/clang/scripts/goma_link_unit_tests.py; \
  tools/clang/scripts/goma_link_integration_tests.py; \
  check that the expected options were passed

Change-Id: Ie5e442bf20f886b899a80a8443fce47a709c006f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231034
Commit-Queue: Bob Haarman <inglorion@chromium.org>
Reviewed-by: Tiancong Wang <tcwang@google.com>
Cr-Commit-Position: refs/heads/master@{#775311}