Abseil LTS branch, Sept 2020

Abseil LTS 20200923

What's New:

• absl::StatusOr<T> has been released. See our blog
  post for more information.
• Abseil Flags reflection interfaces have been released.
• Abseil Flags memory usage has been significantly optimized.
• Abseil now supports a "hardened" build mode. This build mode enables
  runtime checks that guard against programming errors that may lead
  to security vulnerabilities.

Notable Fixes:

• Sanitizer dynamic annotations like AnnotateRWLockCreate that are
  also defined by the compiler sanitizer implementation are no longer
  also defined by Abseil.
• Sanitizer macros are now prefixed with ABSL_ to avoid naming collisions.
• Sanitizer usage is now automatically detected and no longer requires
  macros like ADDRESS_SANITIZER to be defined on the command line.

Breaking Changes:

• Abseil no longer contains a dynamic_annotations library. Users
  using a supported build system (Bazel or CMake) are unaffected by
  this, but users manually specifying link libraries may get an error
  about a missing linker input.

Baseline: 7680a5f
Cherry picks: None

Abseil LTS branch, Feb 2020, Patch 2

This release fixes the list of dependencies of absl::Cord in the CMake build.

Abseil LTS branch, Feb 2020, Patch 1

Patched Feb 2020 LTS branch with the bug fix for absl::Status::ErasePayload.

20200225

Abseil LTS branch, February 2020