Duncan P. N. Exon Smith 223d9cfd30 IR: Extract set logic from Instruction attachments, NFC
Extract the set logic for metadata attachments from `Instruction` so it
can be reused for `Function` (PR23340).

This data structure makes a `SmallVector<>` look (a little) like a map,
just doing the bare minimum to support the `Instruction` (and soon,
`Function`) metadata API.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235769 91177308-0d34-0410-b5e6-96231b3b80d8
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