[phobos] phobos commit, revision 2180

[dsource.org]

phobos commit, revision 2180


user: rsinfu

msg:
Made std.algorithm.swap "@trusted pure nothrow".

Also some minor fixes:
* Made parameter names consistent with ddoc: lhs and rhs.
* 'memcpy' only when T has a non-trivial assignment, i.e. when T defines postblit, destructor and/or opAssign.
* 3-space indent -> 4-space.

http://www.dsource.org/projects/phobos/changeset/2180