Restrict TBI to ignore top 4 bits for Darwin targets. #11982
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In order to allow arm64 code to run on MTE environments, we need to make the compiler only assume the top 4 bits can be ignored as MTE occupies the lower 4. rdar://164645323
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In order to allow arm64 code to run on MTE environments, we need to make the compiler only assume the top 4 bits can be ignored as MTE occupies the lower 4.
rdar://164645323