bug: (x86) always remove the register/memory prefix from the emitted assembly

[qaco]

The printer should not emit code like rr.add, but our Python filecheck implementation only checks substrings (even when the dedicated knob is on). I fix the emitter to make it usable but a long-term solution is either to fix the Python filecheck reimplementation or to py-package LLVM filecheck.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.30%. Comparing base (38089d6) to head (8bfce1b).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3924      +/-   ##
==========================================
- Coverage   91.31%   91.30%   -0.01%     
==========================================
  Files         467      467              
  Lines       58108    58068      -40     
  Branches     5579     5581       +2     
==========================================
- Hits        53060    53021      -39     
+ Misses       3618     3616       -2     
- Partials     1430     1431       +1     

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