[PATCH] [libc++] Make std::deque instantiable with incomplete element type

[Peter Collingbourne]

This is a QOI improvement to allow std::deque to be instantiated with
an incomplete element type.  The only thing preventing it from being
so instantiated was the __block_size constant, which this patch moves
into a constexpr function and calls where necessary.

http://llvm-reviews.chandlerc.com/D1724

Files:
  include/deque
  test/containers/sequences/deque/types.pass.cpp
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