[asan][Darwin] Use Apples blocks extension only when supported (#72639) #72642
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Issue #72639
The commit at 020cdaf broke build of asan on macOS with GCC. GCC does not support the Apple blocks extension (yet). Uses of blocks in other parts of the sanitisers are protected by MISSING_BLOCKS_SUPPORT. But the type definition is not.
This applies FX's patch from the issue.