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* AstGen: Move `refToIndex` and `indexToRef` to Zir * ZIR: the switch_block_*_* instruction tags are collapsed into one switch_block tag which uses 4 bits for flags, and reduces the scalar_cases_len field from 32 to 28 bits. This freed up more ZIR tags, 2 of which are now used for `switch_cond` and `switch_cond_ref` for producing the switch condition value. For example, for union values it returns the corresponding enum value. * switching with multiple cases and ranges is not yet supported because I want to change the ZIR encoding to store index pointers into the extra array rather than storing prong indexes. This will avoid O(N^2) iteration over prongs. * AstGen now adds a `switch_cond` on the operand and then passes the result of that to the `switch_block` instruction. * Sema: partially implement `switch_capture_*` instructions. * Sema: `unionToTag` notices if the enum type has only one possible value.