The shrink_to_fit() method is more readable and more effective than
the copy and swap trick to reduce the capacity of a shrinkable container.
Note that, the shrink_to_fit() method is only available in C++11 and up.
Example:
std::vector<int>(v).swap(v); will be replaced with v.shrink_to_fit();
http://reviews.llvm.org/D7087
Patch by Gábor Horváth!
llvm-svn: 226912