The following changes are introduced:
- If-statements and asserts have now an op-type.
- If-statements are primitive (not encoded with switch).
- The && and || operators are implemented using IfE.
- The front-end uses better types for conditionals and asserts.

This was done using the following sed commands (with ZSH ** pattern):
> sed -i 's/val_of_int/val_of_Z/g' **/*.v
> sed -i 's/val_to_int/val_to_Z/g' **/*.v

Co-authored-by: Michael Sammler <msammler@mpi-sws.org>

Using [block_id] to refer to the first component of locations.

Michael Sammler authored Jul 15, 2020 and Rodolphe Lepigre committed Jul 21, 2020

Co-authored-by: Rodolphe Lepigre <lepigre@mpi-sws.org>