swift234

Revert "Include access functions for the metadata and witness tables"

This reverts commit b1e3120a28f4530700d68d68aa30328d079b29ef.

Reverting because this patch uses WitnessTableBuilder::PI in NDEBUG code.
That field only exists when NDEBUG is not defined, but now NextCacheIndex, a
field that exists regardless, is being updated based on information from PI.

This problem means that Release builds do not work.