[ruby-core:94570] [Ruby master Bug#15887] Process.argv0 can return bad values in Ruby 2.5

Issue #15887 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.4: DONTNEED, 2.5: REQUIRED, 2.6: DONE to 2.4: DONTNEED, 2.5: DONE, 2.6: DONE

ruby_2_5 r67761 merged revision(s) ea42423908ed055f9039b1dce6e9a232a3b2dd90.

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Bug #15887: Process.argv0 can return bad values in Ruby 2.5
https://bugs.ruby-lang.org/issues/15887#change-81027

* Author: joeym (Joey Marianer)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-darwin18]
* Backport: 2.4: DONTNEED, 2.5: DONE, 2.6: DONE
----------------------------------------
MacOS 10.14.5 on a clean (source, using ruby-install) installation of Ruby 2.5.5
```
$ ruby --version
ruby 2.5.5p157 (2019-03-15 revision 67260) [x86_64-darwin18]
$ gem install vault vcr virtus webmock webrick
$ echo Process.argv0 | irb
```
...sometimes returns `{}`, sometimes some other nonsense and sometimes segfaults, but never (or rarely enough that I haven't seen it) returns a string ending in `bin/irb` as expected.

Unfortunately the bug only manifests when certain gems are installed; the set I included above is one possible set of gems that triggers the bug; I don't know what's special about it.



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