[ruby-core:103966] [Ruby master Bug#17868] Strange result of Coverage for while-in-while

Issue #17868 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED to 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE

ruby_3_0 ddd720f8dcd98de6a250a152fa40c3c044d62383 merged revision(s) 5026f9a5d5012248729a0052cd6cec811748291b.

----------------------------------------
Bug #17868: Strange result of Coverage for while-in-while
https://bugs.ruby-lang.org/issues/17868#change-92099

* Author: universato (Yoshimine Sato)
* Status: Closed
* Priority: Normal
* Assignee: mame (Yusuke Endoh)
* Backport: 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE
----------------------------------------
```ruby
n = 3
while n > 0
  n -= 1 while n > 0
end
```
This `while_in_while.rb` is the file to be measured.

```ruby
require "coverage"
Coverage.start
load "while_in_while.rb"
pp  Coverage.result
# {"while_in_while.rb"=>[1, 1, 0, nil]}
```
The value of this lines coverage result should be `[1, 1, 1, nil]`.

```ruby
require "coverage"
Coverage.start(oneshot_lines: true)
load "while_in_while.rb"
pp  Coverage.result
# {"while_in_while.rb"=>{:oneshot_lines=>[1, 2]}}
```
The value of this oneshot lines coverage result should be `[1, 2, 3]`.

```ruby
require "coverage"
Coverage.start(lines: true)
load "while_in_while.rb"
pp  Coverage.result
# {"while_in_while.rb"=>{:lines=>[1, 1, 0, nil]}}
```
The value of this lines coverage result should be `[1, 1, 1, nil]`.



```ruby
require "coverage"
Coverage.start(:all)
load "while_in_while.rb"
pp  Coverage.result
# {"while_in_while.rb"=>
#   {:lines=>[1, 1, 1, nil],
#    :branches=>
#     {[:while, 0, 2, 0, 4, 3]=>{[:body, 1, 3, 2, 3, 20]=>1},
#      [:while, 2, 3, 2, 3, 20]=>{[:body, 3, 3, 2, 3, 8]=>3}},
#    :methods=>{}}}
```

I think the value of this lines coverage result is right. 



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