[5.1][Reflection] Fail gracefully when objc_debug_taggedpointer_obfuscator isn't present. #23099
[Reflection] Fail gracefully when objc_debug_taggedpointer_obfuscator…
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[Reflection] Add some (disabled by default) debug logging in swift-re…
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Cherry-pick #22956 to 5.1.
Older OSes don't have this variable. We can treat it as 0 when it's not present.
Also add some (disabled by default) debug logging in swift-reflection-test.c
rdar://problem/48411483