[ExposeObjCDirect] Setup helper functions #170617
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TL;DR
This is a stack of PRs implementing features to expose direct methods ABI.
You can see the RFC, design, and discussion here.
#170616 Flag -fexpose-objc-direct set up
#170617 Code refactoring to ease later reviews
#170618 Thunk generation
#170619 Optimizations, some class objects can be known to be realized
Implementation details
GenerateDirectMethodsPreconditionCheck: Move some functionalities to a separate functions. Those functions will be reused if we move precondition checks into a thunkDirectMethodInfo, which will be used to manage true implementation and its thunkTests
None, existing ones shouldn't break