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workspace name is needed for package loading, and so splitting out this computation into a separate skyframe node that can be change-pruned gives us better incrementality; previously we'd need to reload all packages on a WORKSPACE file change.
N.B.
(i) This CL doesn't solve all the other performance issues with //external in Bazel/Blaze since it's still inefficiently used for resolving labels like @foo//bar:baz.
(ii) This CL doesn't address the wasteful invalidation + change pruning of all the packages.
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PiperOrigin-RevId: 146925369
MOS_MIGRATED_REVID=146925369
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Nathan Harmata