modernize-make-unique

This check finds the creation of std::unique_ptr objects by explicitly calling the constructor and a new expression, and replaces it with a call to std::make_unique, introduced in C++14.

auto my_ptr = std::unique_ptr<MyPair>(new MyPair(1, 2));

// becomes

auto my_ptr = std::make_unique<MyPair>(1, 2);

This check also finds calls to std::unique_ptr::reset() with a new expression, and replaces it with a call to std::make_unique.

my_ptr.reset(new MyPair(1, 2));

// becomes

my_ptr = std::make_unique<MyPair>(1, 2);

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