[v3 PATCH] Make stateful allocator propagation more consistent for operator+(basic_string) (P1165R1)

[Nina Dinka Ranns]

Tested on Linux x86_64
Make stateful allocator propagation more consistent for
operator+(basic_string) (P1165R1)

2019-05-01  Nina Dinka Ranns  <dinka.ranns@gmail.com>
        Make stateful allocator propagation more consistent for
operator+(basic_string) (P1165R1)
        * include/bits/basic_string.tcc:
         (operator+(const _CharT*, const basic_string&)) : Changed
resulting allocator to be SOCCC on the second parameter's allocator
         (operator+(_CharT, const basic_string&)) : Likewise
         (operator+(basic_string&&,basic_string&&) : Changed resulting
allocator to always be the one from the first parameter
        * testsuite/21_strings/basic_string/allocator/char/operator_plus.cc: New
        * testsuite/21_strings/basic_string/allocator/wchar_t/operator_plus.cc
: New
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