[PATCH] [LIT] Add support for `UNSUPPORTED` tag to `TestRunner.parseIntegratedTestScript`

[Eric Fiselier]

Add documentation for `require_script`. Currently I just need require_script so that I can use that function in tests that don't have RUN lines. Really I just want it to check `XFAIL`, `REQUIRES` and `UNSUPPORTED`. In future I'll need it for tests that can optionally use `RUN` to setup the environment before doing something else.

http://reviews.llvm.org/D6589

Files:
  utils/lit/lit/TestRunner.py
  utils/lit/lit/util.py
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