add test to ensure consistent compatibility macro definitions #64086
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Resolves rdar://106087804
This PR adds a test to ensure that all the compatibility macro definitions are the same as they were in Swift 5.7, ensuring that all the "macro redefinition" errors introduced by #59072 are now resolved. This test copies in a header generated by Swift 5.7, slightly modified to force the macros to be redefined. In this situation, any difference in compatibility macros that existed in Swift 5.7, however slight, will introduce an error.