tvanslyke added a comment.

I'll add that the reason I felt compelled to submit this change was because 
perf was saying most of my program, that only ever moved strings, was spending 
a majority of it's time in string::reserve() calls.  If for no other reason, I 
think it's confusing for people to see string::reserve getting called when all 
they wanted was a move assignment.


https://reviews.llvm.org/D41976



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