[BOLT][NFCI] Keep instruction annotations #80382
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We used to delete most instruction annotations before code emission. It was done to release memory taken by annotations and to reduce overall memory consumption. However, since the implementation of annotations has moved to using existing instruction operands, the memory overhead associated with them has reduced drastically. I measured that savings are less than 0.5% on large binaries and processing time is just slightly reduced if we keep them. Additionally, I plan to use annotations in pre-emission passes for the Linux kernel rewriter.
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We used to delete most instruction annotations before code emission. It was done to release memory taken by annotations and to reduce overall memory consumption. However, since the implementation of annotations has moved to using existing instruction operands, the memory overhead associated with them has reduced drastically. I measured that savings are less than 0.5% on large binaries and processing time is just slightly reduced if we keep them. Additionally, I plan to use annotations in pre-emission passes for the Linux kernel rewriter.