Relink don't rebuild: add a baseline, sound implementation that can be incrementally improved#155871

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susitsm wants to merge 19 commits intorust-lang:mainfrom

susitsm:relink-dont-rebuild-base

Commits on May 9, 2026

tidy: move TargetTuple to a new file
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rdr: implement rmeta public api hash as the stable hash of (almost) all encoded data
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Add public api hash debug logs
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rdr: elaborate on how EII-s should be included in the public api hash
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rdr: document the process of hashing new fields added to CrateRoot
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rdr: document hashed_lazy_array
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rdr: hash spans as if they had no parents (spans are encoded into the rmeta without parents)
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rdr: add the public_api_hash query. Queries provided by rmeta now depend on public_api_hash instead of crate_hash
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rdr: add rustc_public_hash_unchanged and rustc_public_hash_changed attributes for testing
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rdr: add incremental test exercising rustc_public_hash_changed and rustc_public_hash_unchanged attributes
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rdr: use public_api_hash when hashing dependencies
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rdr: use public_api_hash in the rmeta headers
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rdr: move the hashes to crate header, properly handle private and public hashes in the resolver
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rdr: add hash FIXME comments to LazyTables fields
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