Issue #15717 has been reported by alanwu (Alan Wu).

----------------------------------------
Bug #15717: Backport #15270 to Ruby 2.5.x
https://bugs.ruby-lang.org/issues/15717

* Author: alanwu (Alan Wu)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
There is a commit that claims to backport  #15270, `ruby_2_5@66225` / `aba207b7620d963e212e4187213db7e1eee7a790 `.
However, the patch in #15270 wasn't actually backported. For reference, here is a script that outputs 

```
"2.6.2"
3
4
"class 1"
"class 2"
```

On Ruby 2.6.2, but only outputs
```
"2.5.5"
```

on Ruby 2.5.5.

```ruby
p RUBY_VERSION
iseq = RubyVM::InstructionSequence.compile(<<-RUBY)
  class A
    class B
    end
  end
RUBY

iseq_bin = iseq.to_binary
TracePoint.new(:end){|tp|
  p tp.lineno
}.enable{
  RubyVM::InstructionSequence.load_from_binary(iseq_bin).eval
}

TracePoint.new(:class){|tp|
  p "class #{tp.lineno}"
}.enable{
  RubyVM::InstructionSequence.load_from_binary(iseq_bin).eval
}
```


Can we also backport the tests in the patch in #15270?



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