Reland "android: Make the orderfile gold and lld compatible."

Original change's description:
> android: Make the orderfile gold and lld compatible.
>
> Gold wants an orderfile of sections, while lld wants it to contain
> symbols. In both cases unmatched entries are ignored in the orderfile,
> and the generation starts from sections.
>
> This CL changes the orderfile generation pipeline to create orderfiles
> with both sections and symbols.
>
> Also minor cleanups in patch_orderfile.py.
>
> Bug: 778087
> Change-Id: I4219313c40b925d7706064f1f252a692662dfeef
> Reviewed-on: https://chromium-review.googlesource.com/866847
> Commit-Queue: Benoit L <lizeb@chromium.org>
> Reviewed-by: Matthew Cary <mattcary@chromium.org>

Changes made: none, updated downstream scripts.

Bug: 778087
Change-Id: Iec4545590250b66605a28587baec69f672bf3617
Reviewed-on: https://chromium-review.googlesource.com/870115
Reviewed-by: Matthew Cary <mattcary@chromium.org>
Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529727}

• tools/cygprofile/cyglog_to_orderfile.py[diff]
• tools/cygprofile/orderfile_generator_backend.py[diff]
• tools/cygprofile/patch_orderfile.py[diff]
• tools/cygprofile/patch_orderfile_unittest.py[diff]