AstGen: improve switch expressions

* use the proper result location strategy even when there are noreturn
   prongs in the switch expression
 * when using break_operand strategy, actually omit the
   store_to_block_ptr instructions rather than eliding them.
 * for both strategies, properly handle noreturn prongs.
c7b09be8deAndrew Kelley committed on 3/31/2021, 7:37:20 PMparent549af58
1 file changedLine totals unavailable