Previously inherited constructors would be skipped from added in member list, depending on the order of request evaluator calls.
This was a regression compared to swift 5.2
Lazy loading checked if the ClangDecl was hidden, but loading all
members did not. Let's make loadAllMembers() behave like the lazy
path, and fix some of the mock SDKs in the test suite.
This option access a file that lists protocol names that are 'whitelisted' for getting new protocol requirements.
This allows the SDK checker to avoid flagging protocol method additions for protocols that we know are not intended
for user classes to conform to.
