Install new LLVM license structure and new developer policy.

[chandlerc]

Summary

This move all of the license files across all LLVM projects in the monorepo to
the new license structure. The remaining projects will be moved independently.

[chandlerc]

Incorporate the changes to all of the different license files within the
current monorepo.

[chandlerc]

Here is the first patch I plan to land. It applies Chris's policy patch and updates all the license files. I have some questions about the license file updates out to Heather, and I'll track any adjustments here.

[chandlerc]

Updated patch. Rebased and with a fix from Hal.

[chandlerc]

Hopefully add the LLVM foundation board to this as a subscriber.

[lattner]

Fantastic, thanks for driving this.

LICENSE.TXT

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