Patch for Bug 22877

[Arthur Eubanks via cfe-commits]

Hi,

This is my first commit, please feel free to critique any of the code/new test since I'm not quite sure if this is in the correct format.
The patch is for the bug https://llvm.org/bugs/show_bug.cgi?id=22877 <https://llvm.org/bugs/show_bug.cgi?id=22877> regarding cleaning up default arguments in constructors while initializing an array.
It doesn't break any old tests.

Thanks,
Arthur Eubanks

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