Reland "[clang][ssaf][NFC] Move SSAF flags from FrontendOptions to a dedicated SSAFOptions" (#205312) Third attempt of #204686 Previous attempt was: #204798 This was last reverted in #205279 This class will help keeping SSAF options apart from generic FrontendOptions. It is inspired by AnalyzerOptions. This way all of these SSAF (and future) options will be at a centralized place. In preparation of rdar://179151023 --- The previous attempt had issues on Windows with `/permissive` configs. The issue was that `GENERATE_OPTION_WITH_MARSHALLING` had a generic lambda capture and that does not constitute as an ODR-use of the captured name - because that name was only used in an unevaluated context. This meant that MSVC refused to find the function parameter. My speculative solution is to follow the established pattern of passing a pointer to the Opts structure instead of passing it directly as a reference - similar to how `AnalyzerOptions` are passed around that macro.
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