Add llvm::join_items to StringExtras.
llvm::join_items is similar to llvm::join, which produces a string
by concatenating a sequence of values together separated by a
given separator. But it differs in that the arguments to
llvm::join() are same-type members of a container, whereas the
arguments to llvm::join_items are arbitrary types passed into
a variadic template. The only requirement on parameters to
llvm::join_items (including for the separator themselves) is
that they be implicitly convertible to std::string or have
an overload of std::string::operator+
Differential Revision: https://reviews.llvm.org/D24880
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282502
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