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This CL adds llvm-bcanalyzer to the list of files packaged and
downloaded by download_objdump.py. This is needed for extracting
data from .o files (which are LLVM Bitcode Files) under LLD-LTO.

Bug: 723798
Change-Id: I87ef05b17399d56f85ca51e042cbc5415edb8bce
Reviewed-on: https://chromium-review.googlesource.com/1106903Reviewed-by: Hans Wennborg <hans@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569641}