[7.2.0] Add NestedSet<PathFragment>
- and Artifact
-typed compile build var…
#22557
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…iables
This change prepares for C++ path mapping, which also needs to map include directories of generated headers. It may, as a side effect, reduce memory usage slightly by possibly reusing nested set instances retained elsewhere.
Work towards #6526
Closes #22463.
PiperOrigin-RevId: 636886343
Change-Id: Ic93d6439a51f37f44bb2ac67d0813c48c0c4a8bd
Fixes #22533