GROOVY-12235: Interface default method without dynamic calls referenc…

[paulk-asert]

…es unemitted call-site helper under indy=false

[Copilot]

Pull request overview

This PR addresses a non-invokedynamic (indy=false) bytecode generation edge case for interfaces where a call-site array prologue is emitted even when no call sites are registered, which could otherwise lead to NoClassDefFoundError at first invocation.

Changes:

• Track whether the call-site array prologue was emitted during class generation.
• Ensure the interface helper class is materialized whenever a prologue was emitted (not only when call sites were recorded).
• Add regression tests covering interface default and static methods with trivial bodies under indy=false.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/test/groovy/bugs/Groovy12235.groovy	Adds regression tests for interface default/static methods returning null under indy=false.
src/main/java/org/codehaus/groovy/classgen/AsmClassGenerator.java	Switches interface-helper materialization condition to depend on whether a call-site prologue was emitted.
src/main/java/org/codehaus/groovy/classgen/asm/CallSiteWriter.java	Adds a prologueEmitted flag and accessor to indicate whether the call-site prologue was generated for the class.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.9836%. Comparing base (2f85f42) to head (37a37ff).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2767        +/-   ##
==================================================
- Coverage     69.9869%   69.9836%   -0.0033%     
  Complexity      35529      35529                
==================================================
  Files            1557       1557                
  Lines          131686     131688         +2     
  Branches        24174      24173         -1     
==================================================
- Hits            92163      92160         -3     
- Misses          31189      31191         +2     
- Partials         8334       8337         +3     

Files with missing lines	Coverage Δ
...rg/codehaus/groovy/classgen/AsmClassGenerator.java	84.7129% <100.0000%> (ø)
...g/codehaus/groovy/classgen/asm/CallSiteWriter.java	86.6667% <100.0000%> (+0.1282%)	⬆️

... and 4 files with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: 37a37ff
▶️ Tests: 108821 executed
⚪️ Checks: 31/31 completed

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