Codegen: Generates self-assignments in/around parallel maps

[phschaad]

Description Generated code contains self-assignments of variables (e.g. unsigned int fsz0 = fsz0;) in and around parallel maps.

Steps to reproduce:

1. Run the BFS sample (python samples/graph/bfs_bsp.py)
2. Computes the wrong output -> high error/diff in most cases
3. Generated code in .daceche/bfs_bsp/src/cpu/bfs_bsp.cpp contains self assignments.

Expected behavior: Sample runs with an error/diff of 0.0.

Screenshots of self assignments in generated code:

Environment:

• OS: Windows 10 with WSL2 (Ubuntu20.04)