[ruby-core:99858] [Ruby master Feature#17104] Do not freeze interpolated strings when using frozen-string-literal

Issue #17104 has been updated by ko1 (Koichi Sasada).


I found that freezing interpolated strings are help for Ractor programming with constants.

```ruby
class C
  i = 10
  STR = "foo#{i}"
end
```


----------------------------------------
Feature #17104: Do not freeze interpolated strings when using frozen-string-literal
https://bugs.ruby-lang.org/issues/17104#change-87385

* Author: bughit (bug hit)
* Status: Open
* Priority: Normal
* Assignee: Eregon (Benoit Daloze)
----------------------------------------
I think the point of frozen string literals is to avoid needless allocations. Interpolated strings are allocated each time, so freezing them appears pointless. 

```rb
#frozen_string_literal: true

def foo(str)
  "#{str}"
end

fr1 = 'a'
fr2 = 'a'
fr1_1 = foo(fr1)
fr2_1 = foo(fr2)

puts fr1.__id__, fr2.__id__, fr1_1.__id__, fr2_1.__id__

puts fr1_1 << 'b'
```




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