[ConstraintSystem] With designated types enabled, use fewer partitions.
[ConstraintSystem] With designated types enabled, use fewer partitions.

In 119864a0f55c0c5ada23dac3a9a11a2441d3afe5 I moved the consideration
of top-level operators sooner when the designated types feature is
enabled, and that fixed some source compatibility issues that show up
in our test suite, but also introduced a new one.

For maximum source compatibility we'll just split the partitions up
into the operators from designated types, followed by operators that
are not deprecated or disabled, followed by the deprecated ones, and
finally the disabled ones.

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