[ruby-core:93228] [Ruby trunk Bug#15937] Segmentation fault when String#initialize given same string with capacity field

Issue #15937 has been reported by luke-gru (Luke Gruber).

----------------------------------------
Bug #15937: Segmentation fault when String#initialize given same string with capacity field
https://bugs.ruby-lang.org/issues/15937

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Reproduction steps:

string buffer corruption:
```ruby
s = "mystring"
s.__send__(:initialize, s, capacity: 1000)
puts s
```

segfault:

```ruby
s = "mystring that can't be embedded because it's too long and therefore must be allocated"
s.__send__(:initialize, s, capacity: 1000)
```

Thanks for your time :)



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