Fix the mangling algorithm

[kyouko-taiga]

Fixes #961

[codecov]

Codecov Report

Attention: Patch coverage is 88.74046% with 59 lines in your changes missing coverage. Please review.

Project coverage is 88.03%. Comparing base (49b89ed) to head (26ee883).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/IR/Mangling/Demangler.swift	81.81%	20 Missing ⚠️
Sources/IR/Mangling/Mangler.swift	94.87%	18 Missing ⚠️
Sources/IR/Mangling/DemangledQualification.swift	25.00%	12 Missing ⚠️
Sources/IR/Mangling/DemangledSymbol.swift	50.00%	3 Missing ⚠️
...ces/IR/Mangling/DemangledSynthesizedFunction.swift	0.00%	2 Missing ⚠️
Sources/IR/Mangling/DemangledType.swift	0.00%	2 Missing ⚠️
Sources/IR/FunctionID.swift	75.00%	1 Missing ⚠️
Sources/IR/Mangling/DemangledEntity.swift	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1574      +/-   ##
==========================================
+ Coverage   88.00%   88.03%   +0.02%     
==========================================
  Files         374      376       +2     
  Lines       22665    22727      +62     
==========================================
+ Hits        19947    20008      +61     
- Misses       2718     2719       +1     

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