Change string_view::at to make it work with gcc and VC++. Thanks to K-ballo for the bug report, and Jonathan Wakeley for the code review in the bar. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@230260 91177308-0d34-0410-b5e6-96231b3b80d8 
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