Deduce usage of intrinsic types traits by checking if they are present #1197
Description
Currently if we use ETL's no stl default profiles (for example cpp17_no_stl.h), type_traits like is_constructible or is_trivially_copyable doesn't use compiler builtins. Although, the presence of these builtins should be deduced by ETL, which actually it is doing in include/etl/profiles/determine_builtin_support.h, but ETL then is only using the ETL_USE_TYPE_TRAITS_BUILTINS flag. Shouldn't ETL just use the other flags like ETL_USING_BUILTIN_IS_ASSIGNABLE to check if it could use the type traits instrinsics?
A PR with this change has been created here: #1174