Significantly improve Atomic.h by pulling in code from libatomic_ops by HP.  This is a little outdated, but reasonably complete.

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conventions, per John Criswell.

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Added a README.LLVM file to indicate which files and directories
were removed from the original source tarball.

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Cédric Venet.

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Dror GCCLibraries: they are obsolete since 2.0 release. This also reduces number of licenses used in LLVM.

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after llvm-test was split out of llvm.

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licenses.

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Thanks Nate!

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Corrected the GhostScript license information.

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licensing information.

Also added note to indicate that warrany disclaimer and the no-endorsement
clause applies to everything.

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* Use ASCII (c) instead of the special character, which may not display
  correctly for everyone
* Wrap at 80 columns

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