dialects: (riscv) Add scf-to-riscv pass

[AntonLydike]

Add a pass scf-to-riscv that converts scf for ops to riscv.for, for register allocation afterwards.

Missing tests currently.

[codecov]

Codecov Report

Patch coverage: 99.14% and project coverage change: +0.04% 🎉

Comparison is base (18a0b7e) 89.99% compared to head (72d5192) 90.04%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1356      +/-   ##
==========================================
+ Coverage   89.99%   90.04%   +0.04%     
==========================================
  Files         209      212       +3     
  Lines       26155    26272     +117     
  Branches     3897     3907      +10     
==========================================
+ Hits        23539    23657     +118     
+ Misses       2003     2002       -1     
  Partials      613      613              

Files Changed	Coverage Δ
xdsl/backend/riscv/lowering/utils.py	96.55% <96.55%> (ø)
tests/backend/riscv/test_utils.py	100.00% <100.00%> (ø)
xdsl/backend/riscv/lowering/scf_to_riscv_scf.py	100.00% <100.00%> (ø)
xdsl/tools/command_line_tool.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[superlopuh]

TYVM

[AntonLydike]

Can't approve through github as I'm the author, but I approve ✔️

[AntonLydike]

Thanks @adutilleul for this, you basically rewrote everything again!