Since GDB now requires a C++17, replace all uses of gdb::string_view
with std::string_view.
This change has mostly been done automaticall:
- gdb::string_view -> std::string_view
- #include "gdbsupport/gdb_string_view.h" -> #include <string_view>
The implementation and tests of gdb::string_view are unchanged, they will
be removed in a following patch.
Change-Id: Ibb806a7e9c79eb16a55c87c6e41ad396fecf0207