[orc-rt] Add ORC_ENABLE_OSX to control whether to build the orc runtime #75536
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Embedded Darwin platforms have generalized COMPILER_RT_ENABLE_ configuration settings, but currently 'osx' is always eabled on Darwin. Add ORC_ENABLE_OSX to allow explicitly disabling the orc runtime for macOS platform. This can be useful if you only want to build a specific embedded platform. It would be nice to generalize this to handle other compiler-rt projects (i.e. add COMPILER_RT_ENABLE_OSX), but would require additional attention from each compiler-rt project.
Note: some tests currently only are configured for osx, so these are disabled when osx is disabled.