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This is primarily needed to bring in symupload v2 protocol support on Mac.

a740aa2 Fix Mac symupload non-XCode builds
28d7cbd Check for tombstone as very first entry in the line table
7d65240 Properly handle new tombstone values that now appear
1143368 Port new symbol API to symupload on Mac
428a01e There are source files with APSL-2.0 as well
2e6f8de Add 3-clause BSD license text as well
678c4c5 Include libunwind license in LICENSE file
721108f fix NDEBUG breakage with new dwarf5 code
09b0569 fix pointer style to match the style guide
a741027 Add support for dwarf5 line tables
b6f36dd Move GetSectionByName out of CompilationUnit
8efe0f1 Read dwarf5 compilation unit headers
72c118f Add and handle various dwarf5 addrx forms
feb2dca Add and handle new dwarf5 string-related forms

BUG=1021742

Change-Id: I7ed42d6696452c58bdbbdee324248c656b180605
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321537
Commit-Queue: Michael Moss <mmoss@chromium.org>
Auto-Submit: Michael Moss <mmoss@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793068}