Commits on Feb 23, 2022

1. asm: moved Instruction.Symbol and Instruction.Reference into metadata …

   This commit adds per-instruction metadata, which is sparse in nature,
   meaning that most instructions don't have metadata but some do. Metadata
   is linked to an instruction via a pointer which is nil by default, thus
   if an instruction has no metadata, at most one pointer worth of space is
   unused which is desirable since we expect the size of the metadata
   struct to grow in future commits.
   
   The metadata struct is copy-on-write, so multiple instructions can share
   the same metadata object after being copied, but as soon as a
   modification on one of the instruction's metadata is performed, the
   metadata object is copied so writes to a copied instruction doesn't
   effect the original instruction.
   
   This commit also deprecates `Instruction.Sym` in favor of
   `Instruction.WithSymbol`. This follows the convention of prefixing
   func names with `With...` if they have value receivers to make it clear
   to callers that this doesn't modify the instruction it is being called
   on.

   Dylan Reimerink committed Feb 23, 2022
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   6d93b9f View commit details

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