Create new diagnostic group -Wmove
Create new diagnostic group -Wmove

-Wmove includes the three existing warnings for std::move calls, self move,
reduntant move, and pessimizing move.  -Wmove is included in -Wmost, so that
it can be discoverable to people using that or -Wall.

Differential Revision: http://reviews.llvm.org/D9493 


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@237610 91177308-0d34-0410-b5e6-96231b3b80d8

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