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

[Eric Fiselier]

Hi ddunbar,

This patch gives me just enough to leverage the existing functionality in `TestRunner` for use in `libc++` and `libc++abi` .

It does the following:
* Adds the `UNSUPPORTED` tag to `TestRunner.parseIntegratedTestScript`.
* Allows `parseIntegratedTestScript` to return an empty script if a script is not required by the caller.

http://reviews.llvm.org/D6589

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