Remove conditional return instructions

[Robbepop]

Closes #1482.

ToDos

• Some translation tests that have been commented out need to be updated instead.
• One Wast test is still failing and I have not yet figured out why.
• Check how Wasmi execution performance is affected by this change.
  • Benchmarks show minimal improvements across the board. Though some of those improvements are within the range of noise.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.33%. Comparing base (8e8495b) to head (b8a39d3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1486      +/-   ##
==========================================
+ Coverage   71.27%   71.33%   +0.06%     
==========================================
  Files         172      172              
  Lines       16504    16407      -97     
==========================================
- Hits        11763    11704      -59     
+ Misses       4741     4703      -38     

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