Minor: fix msvc warning "not all control paths return a value" #1
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When building with /Od - default cmake debug build for me, the __assume(false); trick does not work to get rid of the C4714 warnings https://godbolt.org/z/a6xGnfP7d D:\tmp\cppcheck\lib\keywords.cpp(205): warning C4715: 'Keywords::getOnly': not all control paths return a value D:\tmp\cppcheck\lib\keywords.cpp(226): warning C4715: 'Keywords::getOnly': not all control paths return a value D:\tmp\cppcheck\lib\keywords.cpp(168): warning C4715: 'Keywords::getAll': not all control paths return a value D:\tmp\cppcheck\lib\keywords.cpp(188): warning C4715: 'Keywords::getAll': not all control paths return a value Proposed fix: also define NORETURN to [[noreturn]] when according to __has_cpp_attribute [[noreturn]] is supported https://en.cppreference.com/w/cpp/feature_test (For previous discussion see also danmar#5497)
Moved __has_cpp_attribute block up to first choice. When we have a portable standard way of expressing it, that's the best choice. (Addresses Review Feedback from Firewave)
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When building with /Od - default cmake debug build for me, the __assume(false); trick does not work to get rid of the C4714 warnings
https://godbolt.org/z/a6xGnfP7d
D:\tmp\cppcheck\lib\keywords.cpp(205): warning C4715: 'Keywords::getOnly': not all control paths return a value
D:\tmp\cppcheck\lib\keywords.cpp(226): warning C4715: 'Keywords::getOnly': not all control paths return a value
D:\tmp\cppcheck\lib\keywords.cpp(168): warning C4715: 'Keywords::getAll': not all control paths return a value
D:\tmp\cppcheck\lib\keywords.cpp(188): warning C4715: 'Keywords::getAll': not all control paths return a value
Proposed fix: also define NORETURN to [[noreturn]] when according to __has_cpp_attribute [[noreturn]] is supported https://en.cppreference.com/w/cpp/feature_test
(For previous discussion see also danmar#5497)