[patch] Fix libstdc++/36962

[Paolo Carlini]

-- Jonathan,

if you have got two spare minutes, I'd like to understand in some better 
detail the logic in the new _S_create_from_up functions. Doesn't seem 
obvious to me, reading the standard, that we have to use 
reference_wrapper explicitly. In other terms, I'd like to understand why 
applying the below all the existing tests still work, or we need one 
more testcase, or something...

Thanks in advance!
Paolo.

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