…n and context_function

…ction

The context_function now don't reset input table. Most parts of inner
Mlang making use of context_function or Bir.main_statements are now
using context_function_with_reset or Bir.main_statements_with_reset as
they are linked to the interpreter.

…o_context

…and store them as their own mpp_function field

…t list fields

…tion are already added by Bir_interface.adapt_program_to_function

…nctions map is now always agnostic, context being stored outside it.

….program to the Oir output without change

…tial Bir.program to the Oir output without change"

This reverts commit c79a4ce.

…function-selection-in-bir

…-function-selection-in-bir

…_tgv_init and add comment explaining why BIR interpreter needs the addition of these initialisation statements