Use bit-field int values in buildPartial to skip work on unset groups of fields. #10960
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Changes to make this improvement:
All non-repeated builder fields (including maps) now have a presence bit regardless of syntax.
The buildPartial method is split into one method per 32-field block (aligned with bit-mask ints)
If a presence bit-mask int is set to 0, no fields are present, so we can skip the logic for all of those fields in the buildPartial step.
For messages with a lot of fields (> 100) that are sparsely populated this can result in a significant improvement. Not only does it potentially skip a lot of field copying logic, but also breaks the buildPartial method into chunks that should be more easily digested by the JIT compiler as discussed in this issue: #10247.
PiperOrigin-RevId: 485952448