[v3 PATCH] Implement Fundamentals v2 propagate_const

[Ville Voutilainen]

Tested on Linux-PPC64. Patch gzipped to avoid polluting people's
mailboxes with a 45k patch.

2015-07-03  Ville Voutilainen  <ville.voutilainen@gmail.com>
    Implement std::experimental::fundamentals_v2::propagate_const.
    * include/Makefile.am: Add propagate_const.
    * include/Makefile.in: Add propagate_const.
    * include/experimental/propagate_const: New.
    * testsuite/experimental/propagate_const/assignment/copy.cc: Likewise.
    * testsuite/experimental/propagate_const/assignment/move.cc: Likewise.
    * testsuite/experimental/propagate_const/assignment/move_neg.cc:
    Likewise.
    * testsuite/experimental/propagate_const/cons/copy.cc: Likewise.
    * testsuite/experimental/propagate_const/cons/default.cc: Likewise.
    * testsuite/experimental/propagate_const/cons/move.cc: Likewise.
    * testsuite/experimental/propagate_const/cons/move_neg.cc: Likewise.
    * testsuite/experimental/propagate_const/hash/1.cc: Likewise.
    * testsuite/experimental/propagate_const/observers/1.cc: Likewise.
    * testsuite/experimental/propagate_const/relops/1.cc: Likewise.
    * testsuite/experimental/propagate_const/requirements1.cc: Likewise.
    * testsuite/experimental/propagate_const/requirements2.cc: Likewise.
    * testsuite/experimental/propagate_const/requirements3.cc: Likewise.
    * testsuite/experimental/propagate_const/requirements4.cc: Likewise.
    * testsuite/experimental/propagate_const/requirements5.cc: Likewise.
    * testsuite/experimental/propagate_const/swap/1.cc: Likewise.
    * testsuite/experimental/propagate_const/typedefs.cc: Likewise.
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