[StdLib] Refactor ObjC code in Set validation tests #970
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This PR is not ready for merging because it depends on input file refactoring, (which is in it's own PR -- #968). It is also included below so that the PR makes sense. As soon as that PR is merged, I will rebase this one on top of it.
Move tests that need the Objective-C runtime into their own file and remove the
XFAIL on Linux. This partially resolves SR-216.
Tested on Ubuntu 14.04 and OS X 10.10.
I ran into a little snag here. The type checker does not like to type check AnyObject in these files. The code works but is very sensitive. Unrelated code changes will cause type checking to fail. Unlike the Dictionary test refactoring in PR #969, I was able to get this to work without including unnecessary code in order to make the type checker happy.
I've opened SR 524 and SR 525 with minimized test cases for this behavior. Is this satisfactory?