runtime iseqs wip

[p-datadog]

What does this PR do?

Motivation:

Change log entry

Additional Notes:

How to test the change?

[github-actions]

👋 Hey @p-datadog, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

None.

(possible answers No/Nope/None)

^{Visited at: 2025-03-27 19:48:31 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: runtime-iseqs
Commit report: 1b39a26
Test service: dd-trace-rb

❌ 1 Failed (0 Known Flaky), 20756 Passed, 1348 Skipped, 3m 37.13s Total Time
❄️ 1 New Flaky

❌ Failed Tests (1)

• all_iseqs returns iseqs for all required files - rspec - Details

  Expand for error

   cannot load such file -- libdatadog_api.3.3_x86_64-linux
   
   Failure/Error: require 'libdatadog_api.3.3_x86_64-linux'
   
   LoadError:
     cannot load such file -- libdatadog_api.3.3_x86_64-linux
   ./spec/datadog/di/loaded_file_iseq_spec.rb:5:in 'block (2 levels) in <top (required)>'
  

New Flaky Tests (1)

• all_iseqs returns iseqs - rspec - Last Failure

  Expand for error

   cannot load such file -- libdatadog_api.3.3_x86_64-linux
   
   Failure/Error: require 'libdatadog_api.3.3_x86_64-linux'
   
   LoadError:
     cannot load such file -- libdatadog_api.3.3_x86_64-linux
   ./spec/datadog/di/loaded_file_iseq_spec.rb:5:in 'block (2 levels) in <top (required)>'
  

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-04-14 18:03:34

Comparing candidate commit 1b39a26 in PR branch runtime-iseqs with baseline commit d70b89c in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[ivoanjo]

Btw, in part to avoid weird conflicts in the future, I've worked with @vpellan to get his #4561 PR in master, which also introduces an init.c. So for this PR it should be as easy as adopting that file as well.

[p-datadog]

Superseded by #5111