[ruby-core:108693] [Ruby master Bug#18804] Invalid number for putnil instruction

Issue #18804 has been reported by hurricup (Alexandr Evstigneev).

----------------------------------------
Bug #18804: Invalid number for putnil instruction
https://bugs.ruby-lang.org/issues/18804

* Author: hurricup (Alexandr Evstigneev)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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Looks like this is a pretty old bug. Consider example:
```
def foo1
  if true
    nil
  else
    1
  end
end

def foo2
  if true
    42
  else
    1
  end
end

foo1_method = method(:foo1)
puts RubyVM::InstructionSequence.of(foo1_method).disasm

foo2_method = method(:foo2)
puts RubyVM::InstructionSequence.of(foo2_method).disasm
```

Gives us: 
```
== disasm: #<ISeq:foo1@/home/hurricup/RubymineProjects/untitled28/test.rb:1 (1,0)-(7,3)> (catch: FALSE)
0000 putnil                                                           (   2)[LiCa]
0001 leave                                                            (   7)[Re]
== disasm: #<ISeq:foo2@/home/hurricup/RubymineProjects/untitled28/test.rb:9 (9,0)-(15,3)> (catch: FALSE)
0000 putobject                              42                        (  11)[LiCa]
0002 leave                                                            (  15)[Re]
```

`putnil` has line set to 2 (and it should be 3)
`putobject 42` has line set to 11 and this is correct one.

User unable to put a breakpoint to the nil in debugger because of this. 



-- 
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