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Fix Objective-C runtime code on Catalina and re-enable tests #2777
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This reverts commit 7357afe.
These tests were broken because we couldn't read the lazily named classes. With that issue resolved, these tests pass again.
On macOS Catalina, calling objc_debug_class_getNameRaw on some of the ISA pointers returns NULL, causing us to crash and unwind before reading all the Objective-C classes. This does not happen on macOS Big Sur. Account for that possibility and skip the class when that happens. (cherry picked from commit cf51bf7) (cherry picked from commit 756f6e2)
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