mfc macro optimization of the tailing v = for-emuns

[SerhiyShamshetdinov]

DO AFTER #10

Scope (class, macro, etc.)
Postprocessing of TmsExtracted (of 1 Monadic Flow for)

What may be better or simplified?
build more optimal for-comprehansion of the Monadic Flow Type (without tailing 'v = ' for-enums).

Describe the solution
For the current mfc implementation with one monadic flow for: after the flattening result do postprocessing.
Do seq of tailing for v = optimization: move ones to the start of yield: yieldStats (new: see other issue ?) in each forCollector ...

This keeps semantic of the macro unchanged but makes produced code more effective.

Tests
should pass without changes