objc: create new blocks as stack blocks so Copy moves them - #518
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NewBlock built its template with an __NSMallocBlock__ isa, for which _Block_copy is a no-op retain of the Go-side allocation. The Block then points at Go memory invisible to the collector. Start from __NSStackBlock__ so Copy relocates the block to the heap as the ABI requires.
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What issue is this addressing?
Closes #523
What type of issue is this addressing?
bug
What this PR does | solves
NewBlock built its template with an NSMallocBlock isa, for which _Block_copy is a no-op retain of the Go-side allocation. The Block then points at Go memory invisible to the collector. Start from NSStackBlock so Copy relocates the block to the heap as the ABI requires.