[PATCH] D40144: Implement `std::launder`

[Marshall Clow via Phabricator via cfe-commits]

mclow.lists created this revision.

`std::launder` was introduced into c++17 as a compiler optimization barrier.  It's something that the compiler 'knows about', and affects codegen.

See https://wg21.link/p0137r1 for more.


https://reviews.llvm.org/D40144

Files:
  include/new
  test/std/language.support/support.dynamic/ptr.launder/launder.fail.cpp
  test/std/language.support/support.dynamic/ptr.launder/launder.pass.cpp
  www/cxx1z_status.html

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