GROOVY-11858: defer non-closure method for in-closure implicit-this call

[eric-milles]

Wait to execute an Object extension method until no method has been found on delegate or owner.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.7223%. Comparing base (9b4ec31) to head (a688de6).
⚠️ Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
...aus/groovy/runtime/metaclass/ClosureMetaClass.java	63.6364%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2379        +/-   ##
==================================================
+ Coverage     66.7154%   66.7223%   +0.0069%     
- Complexity      29846      29854         +8     
==================================================
  Files            1382       1382                
  Lines          116180     116189         +9     
  Branches        20491      20497         +6     
==================================================
+ Hits            77510      77524        +14     
+ Misses          32323      32318         -5     
  Partials         6347       6347                

Files with missing lines	Coverage Δ
src/main/java/groovy/lang/MetaClassImpl.java	77.7716% <ø> (ø)
...aus/groovy/runtime/metaclass/ClosureMetaClass.java	72.6027% <63.6364%> (-0.1888%)	⬇️

... and 3 files with indirect coverage changes

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