<xstring>: Suppress code analysis warning C6510 for basic_string
#5563
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When instantiating
basic_stringwith character types of class type, code analysis warning C6510 is produced. See here: https://gcc.godbolt.org/z/8dhaG8bd4I noticed this while working on #995, when I tried to instantiate
basic_regex(and hencebasic_string) with a character type of class type to extend test coverage.#3032 already resolved this issue for
basic_string_view. This PR applies the same fix (warning suppression) tobasic_stringand extends the existing test coverage tobasic_string. (Strictly speaking, the extended test isn't run in C++14 mode, but I think this is still good enough to validate a warning suppression applied unconditionally. And there will soon be positive indirect coverage in C++14 mode via the PRs for #995.)