[SAoC] Move semantics and STL containers

[Suleyman]

Week 7:

More progress on issue 20321. Made a second pull request[1].
Also audited all temporaries which are created in the glue layer 
of DMD and compiled a report about it[2]. This narrowed down the 
problem significantly. The report contains links to test cases 
and links to the pull request that has the fix if available.

[1] https://github.com/dlang/dmd/pull/10539
[2] 
https://gist.github.com/SSoulaimane/f87a9f86dc8808eab8ac787e237b47b2