[PATCH] Warning on unused results in an unevaluated context

[Aaron Ballman]

We currently emit diagnostics warning about unused results while in an
unevaluated context. This seems a bit strange to me, since an
unevaluated context implies we aren't using *any* results. This patch
addresses that by not emitting such diagnostics from an unevaluated
context. It also fixes PR18571.

~Aaron
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