fix: simplify darwin/arm64 implementation#14
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Instead of copying the text segment and running from the copy, remap the copy with r-x perms on top of the existing text segment. Then keep the copy as an rw- mapping to the same physical memory.
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Instead of copying the text segment and running from the copy, remap the copy with r-x perms on top of the existing text segment. Then keep the copy as an rw- mapping to the same physical memory.