Optimize GC churn due to PackageFunction#getContainingDirectory. While I'm here, also slightly restructure the code in #handleLabelsCrossingSubpackagesAndPropagateInconsistentFilesystemExceptions to make it more readable (and defer PackageIdentifier allocations). Alternatives considered: Add a PathFragment#getParentDirectoryOfRelative(String other) instance method, and use it in PackageFunction#getContainingDirectory. I thought the approach in this CL would be preferable to adding a specialized method like that to PathFragment. RELNOTES: None PiperOrigin-RevId: 189197855
{Fast, Correct} - Choose two
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