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dim
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2019-12-22T11:58:44.222331Z
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Merge commit f97936fab from llvm git (by Eric Fiselier):

  [libc++] Cleanup and enable multiple warnings.

  Too many warnings are being disabled too quickly. Warnings are
  important to keeping libc++ correct. This patch re-enables two
  warnings: -Wconstant-evaluated and -Wdeprecated-copy.

  In future, all warnings disabled for the test suite should require an
  attached bug. The bug should state the plan for re-enabling that
  warning, or a strong case why it should remain disabled.

This should fix a number of new g++ 9 warnings.

Requested by:	rlibby
MFC after:	3 days

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