Creation of LTS branch "lts_2019_08_08"

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  - 3c98fcc0 Merge pull request #340 from jtsylve/macos_cxx17_fix by Matt Calabrese <38107210+mattcalabrese-google@users.noreply.github.com>
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  - 5162fc83 Merge pull request #336 from shields/patch-2 by Shaindel Schwartz <31392632+shaindelschwartz@users.noreply.github.com>
  - 0389f7bf Merge pull request #335 from shields/patch-1 by Shaindel Schwartz <31392632+shaindelschwartz@users.noreply.github.com>
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  - a13d3df2 Merge pull request #323 from gosnik/master by Gennadiy Rozental <rogeeff@google.com>
  - 310a1186 Merge pull request #324 from RasPat1/patch-1 by Gennadiy Rozental <rogeeff@google.com>
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  - 0238ab0a Merge pull request #321 from christoph-cullmann/c4245_fix... by Xiaoyi Zhang <zhangxy988@gmail.com>
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  - bc9101f9 Merge pull request #320 from christoph-cullmann/master by Xiaoyi Zhang <zhangxy988@gmail.com>
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  - 27c30ec6 Avoid undefined behavior when nullptr is passed to memcpy... by Roman Gershman <romange@gmail.com>
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  - 253eb741 [CMake] Set correct flags for clang-cl (#278) by Loo Rong Jie <loorongjie@gmail.com>
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  - 6fd82712 Merge pull request #280 from chiumichael/master by Derek Mauro <761129+derekmauro@users.noreply.github.com>
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  - c1cecb25 Implement Span::first and Span::last from C++20 (#274) by Girts <girtsf@users.noreply.github.com>
  - 38b70438 Changed HTTP URLs to HTTPS where possible (#270) by nik7273 <nik8470@gmail.com>
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  - 89ea0c5f Merge pull request #255 from uilianries/hotfix/conan by ahedberg <ahedberg@google.com>
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  - 6b4201f9 Fix GCC8 warnings by Boris Staletic <boris.staletic@gmail.com>
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  - 9449ae94 Merge pull request #243 from ThomsonTan/FixIntrinsic by Alex Strelnikov <strel@google.com>
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  - 3e2e9b55 Merge pull request #231 from uilianries/feature/conan by Mark Barolak <mbxx@users.noreply.github.com>
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GitOrigin-RevId: 9ee91d3e
Change-Id: Ia06e548bc106cc9d136f6c65714be6645317aced