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In furtherance of possibly putting a limit on additional native relocations
added to the binary. A count of native relocations is now included in the
metadata of the .size file.

This reverts commit 936b6478.

Reason for reland: this cl works on 64bit elf files.

Original CL:
> https://chromium-review.googlesource.com/c/chromium/src/+/1879504

Bug: 1012373
Change-Id: I47c7fc8e73b6ad05d3ecd9dfd235f8904e9d7c9b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1889946Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711261}