Mike Ash 4d62c521bd [Runtime] Avoid dlsym of objc_isUniquelyReferenced. ...

We attempted to use the declaration if it exists, and fall back to dlsym. This didn't actually work and we always call dlsym. Include the right header (when available) and add a weak check to the direct call.

rdar://127116080

2024-04-26 11:44:28 -04:00

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