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Emil J. Tywoniak 16db584210 rtlil frontend: keep the handles a file names
A replayable .il names twines and source location sets by pool index, and
a design that has freed slots writes a set with gaps in it. Reading such a
file into a fresh design packed the survivors, so write, read, write did
not reproduce the file.

Let the pools intern at a caller-chosen index and use that while loading
into a design with no twines or srcs of its own, falling back to the old
remapping when the file's numbering does not fit this build.
2026-08-25 12:42:21 +02:00
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2026-06-03 08:58:10 +00:00