[PATCH] D10963: Implement LWG#2063: "Contradictory requirements for string move assignment"

[Marshall Clow]

mclow.lists added a reviewer: EricWF.
mclow.lists added a subscriber: cfe-commits.

Update the noexcept-ness of move-construction and move-assignment for `basic_string`. Use the new "is_always_equal" type trait for noexcept stuff when we're building with C++17. Preserve the conforming extension that we had before for C++14 and before.

Note that in C++17, if POCMA is true, then move-assigning an allocator cannot throw an exception.

http://reviews.llvm.org/D10963

Files:
  include/string
  test/std/strings/basic.string/string.cons/move_assign_noexcept.pass.cpp
  test/std/strings/basic.string/string.modifiers/string_swap/swap.pass.cpp

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