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BuildOptions$DiffForReconstruction serializations are reached in this way, so we get better efficiency. Also, it was already a custom codec, so less new handrolling.
Also use serialization framework for FragmentClassSet, instead of doing serialization directly. Default FragmentClassSet should be a constant, so it will serialize down to a byte or three. Future changes can make all the classes constants as well, if we're getting misses on them.
PiperOrigin-RevId: 196546279
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BuildConfiguration.Fragment>> set of Fragment classes that is part of the BuildConfigurationValue.Key. This class allows us to compute a fingerprint of the wrapped ImmutableSortedSet, making equality comparisons fast. The number of additional wrapper objects is the number of distinct sets of fragment classes, so 1. (In fact, we don't even need to compute a fingerprint, since reference equality does the job for us here, but we do it just to be conservative.)
This CL has a performance benefit for Bazel currently, but has a bigger performance benefit in the following changes, where there are more BuildConfigurationValue.Key objects to compare.
PiperOrigin-RevId: 183090122
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janakr