[PATCH] Make the presence of stdin and stdout optional

[Jonathan Roelofs]

This part looks OK.

Is there any value in gating the stdout & stdin bits separately?


================
Comment at: test/std/input.output/iostream.objects/narrow.stream.objects/cin.pass.cpp:1
@@ -1,2 +1,2 @@
 //===----------------------------------------------------------------------===//
 //
----------------
Wow, this test is confusing now. I'm not sure how to make that better.

http://reviews.llvm.org/D8340

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