Compile only blocks with a loop, keep no code for a module without one, set a frame's fields one by one, and inline group_of (021)

- Compiled code paid only where blocks repeat; a block run once (a view's
  cell, a fold's item, most handlers) ran slower through the code's entry
  and its calls of step: the bank's table queries took 16-24% more
  instructions. Now only a block with an EACH or a LOOP is compiled, and
  a module with none keeps no compiled code.
- run() set its whole frame each time (the compiled code's run among it);
  now its fields one by one.
- group_of is inlined into its pass: after the executor's refactor it
  was a call per row (per_branch +4-5% instructions; now +1.1-1.3%).

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