[PATCH] Re-factor TableGen docs

[Renato Golin]

Hi silvas, aaron.ballman,

This is mainly a movement of content around to give place to new content
allowing different people to add bits to it in the right place. There is some
new content, but mostly to fill the gaps left by text movement.

I'm dropping the old syntax documentation as it has the problem of being
quickly outdated by changes and largely unnecessary to people not involved
in creating the language, but using it, which is the whole point of the
documentation.

The nice overall description of TableGen usage fits the bill of a good language description.

The Clang backends were added to this doc, and I think we should keep them here, not in Clang,
since this is an LLVM tool. Clang docs can still refer to it via direct links, or maybe the Clang
back-ends could be described there, pointing to the root of this doc. I'm open to suggestions.

http://llvm-reviews.chandlerc.com/D3120

Files:
  docs/TableGen/BackEnds.rst
  docs/TableGen/Deficiencies.rst
  docs/TableGen/LangRef.rst
  docs/TableGen/index.rst
  docs/index.rst
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