Drop ASM dependency from NullGaurdsTest

[jack-berg]

Now that we use java 25 for the build, we can drop the asm dependency and in favor of built in java.lang.classfile.* classes.

[opentelemetry-pr-dashboard]

Pull request dashboard status

Merged · refreshed 2026-10-19 19:43 UTC

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.42%. Comparing base (b32298a) to head (f719d59).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8954      +/-   ##
============================================
+ Coverage     90.40%   90.42%   +0.01%     
- Complexity    10898    10901       +3     
============================================
  Files          1015     1015              
  Lines         29843    29843              
  Branches       3896     3896              
============================================
+ Hits          26981    26985       +4     
+ Misses         1910     1909       -1     
+ Partials        952      949       -3     

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