[ruby-core:91354] [Ruby trunk Bug#15576] Wrong error message from some class methods of `Dir`

Issue #15576 has been reported by takaram (Takuya Aramaki).

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Bug #15576: Wrong error message from some class methods of `Dir`
https://bugs.ruby-lang.org/issues/15576

* Author: takaram (Takuya Aramaki)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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When a error is raised in some class methods of `Dir`, the backtrace is as if the user called `Dir.open`.

```
$ ruby -e 'Dir.foreach {}'
Traceback (most recent call last):
	2: from -e:1:in `<main>'
	1: from -e:1:in `foreach'
-e:1:in `open': wrong number of arguments (given 0, expected 1) (ArgumentError)
$ ruby -e 'Dir.foreach(nil)'
Traceback (most recent call last):
	2: from -e:1:in `<main>'
	1: from -e:1:in `foreach'
-e:1:in `open': no implicit conversion of nil into String (TypeError)
$ ruby -e 'Dir.foreach("not_exist")'
Traceback (most recent call last):
	2: from -e:1:in `<main>'
	1: from -e:1:in `foreach'
-e:1:in `open': No such file or directory @ dir_initialize - not_exist (Errno::ENOENT)
```

The last line of the error message should be ``-e:1:in `foreach': ...`` like `IO.foreach`

This occurs in following methods:
* `Dir.foreach`
* `Dir.entries`
* `Dir.each_child`
* `Dir.children`



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