Lazily acquire singleton class for instance_eval#9440
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This is based on the work done in ruby/ruby#5146 and defers creation of the singleton class until class-level changes are necessary (method definitions, etc). We add a singleton flag to the scope that is used to acquire the singleton class as needed. Fixes jruby#8638
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This is based on the work done in ruby/ruby#5146 and defers creation of the singleton class until class-level changes are necessary (method definitions, etc). We add a singleton flag to the scope that is used to acquire the singleton class as needed.
Fixes #8638