* [IRGen] Use EnumImplStrategy to generate getEnumTag function for layout strings
rdar://110794898
The implementation in TypeLayout seems to have a bug causing wrong tags to be returned on 32 bit systems.
* Don't use unsupported types in tests
* [IRGen] Handle complex single payload enum cases
rdar://110138498
Handles single payload enum cases with more complex bit patterns (e.g. >64 bits or scattered) by storing a relative pointer to a function that reads the tag.
* Use proper symbol for enum tag helper
rdar://110088270
When extra tag bytes are used in single payload enums, the generated layout string does not include the tag bytes in its offset after the enum payload. This causes subsequent ref count operations to use the wrong memory location.
* [IRGen] Support additional single payload enum cases in layout strings
rdar://105837101
Adds layout string support for single payload enums with simple (non-scattered) extra inhabitant patterns
* Add more test cases
* [IRGen] Fix layout string generation for pre-specialized metadata
rdar://108012057
Pre-specialized metadata has to be specifically handled by using the bound generic type instead of the unbound one. All the necessary information is already being passed down as BoundGenericTypeCharacteristics, we just need to apply them when present.
* Add tests and a few fixes
* Fixes after rebase
* Attempt to fix Windows linker issue in test
* [IRGen] Reject enums with inaccessible tpye metadata in layout string generation
rdar://107679697
Because we are currently handling most enums in layout strings by going through the metadata, we have to ensure that the metadata is accessible from the current module and reject the enum otherwise.
* Use proper mechanism to create and reference dylib in test
* Fix linking
* Add rpath to test dylib
rdar://105837040
* WIP: Store layout string in type metadata
* WIP: More cases working
* WIP: Layout strings almost working
* Add layout string pointer to struct metadata
* Fetch bytecode layout strings from metadata in runtime
* More efficient bytecode layout
* Add support for interpreted generics in layout strings
* Layout string instantiation, take and more
* Remove duplicate information from layout strings
* Include size of previous object in next objects offset to reduce number of increments at runtime
* Add support for existentials
* Build type layout strings with StructBuilder to support target sizes and metadata pointers
* Add support for resilient types
* Properly cache layout strings in compiler
* Generic resilient types working
* Non-generic resilient types working
* Instantiate resilient type in layout when possible
* Fix a few issues around alignment and signing
* Disable generics, fix static alignment
* Fix MultiPayloadEnum size when no extra tag is necessary
* Fixes after rebase
* Cleanup
* Fix most tests
* Fix objcImplementattion and non-Darwin builds
* Fix BytecodeLayouts on non-Darwin
* Fix Linux build
* Fix sizes in linux tests
* Sign layout string pointers
* Use nullptr instead of debug value
