Move away from obj->isa, and wrap the workAroundMacOSXABIBreakingBug...#141

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jrmiddle wants to merge 1 commit intojohnezang:masterfrom jrmiddle:master

+20-19

Commits on Oct 20, 2013

Move away from obj->isa, and wrap the workAroundMacOSXABIBreakingBug check with a diagnostic ignore (bitmasking tagged pointers is deprecated).
Justin Middleton
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