[claude-code] trivial ssa destruction implementation

[RealA10N]

This is my first vibe coding experience. I just gave claude code a link to #43 and it went and implemented it. Burned 4.25$ (API) with Claude Opus 4.6.

Seems like a decent implementation to be, although it took the trivial approach, and not the approach I intended in #43. Needs some more polish before merging (for example, I don't like the generated label names currently, and the tests structure can be improved, and more tests should be added).

Plus, I did not touch to project for a year+, so I do not feel comfortable to merge this because I do not remember the project structure, best practices, etc. So for now I'm leaving it and hopefully I will make the appropriate changes & merge some day.

[codecov]

Codecov Report

❌ Patch coverage is 81.57895% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.42%. Comparing base (47fd24d) to head (093cfd1).

Files with missing lines	Patch %	Lines
usm/ssa/ssa_destruction.go	75.00%	11 Missing and 1 partial ⚠️
gen/basic_block_info.go	0.00%	7 Missing ⚠️
usm/ssa/critical_edge_splitting.go	91.52%	4 Missing and 1 partial ⚠️
usm/ssa/parallel_copy.go	89.47%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   36.32%   43.42%   +7.09%     
==========================================
  Files         122      125       +3     
  Lines        4583     3853     -730     
==========================================
+ Hits         1665     1673       +8     
+ Misses       2838     2078     -760     
- Partials       80      102      +22     

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