Add Arm64 atomicops to base.

These are taken from the implementation in v8/src/atomicops_internals_a64_gcc.h

BUG=354405

Review URL: https://codereview.chromium.org/206373005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@258985 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 7ec8166d0951d2af3ee71f7ac3dc80776ff9539b
2 files changed
tree: 270fbf2e855d0af350f0cb1e5ed98c6cb005e581
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. ipc/
  6. mojo/
  7. testing/
  8. third_party/
  9. ui/