[ruby-core:111813] [Ruby master Bug#19341] Write cache issue with class variables

Issue #19341 has been reported by luke-gru (Luke Gruber).

----------------------------------------
Bug #19341: Write cache issue with class variables
https://bugs.ruby-lang.org/issues/19341

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
``` ruby
class SetCvar
  def self.set(val)
    @@a = val # inline cache
  end
end

def test_set_cvar_on_frozen_object
  SetCvar.set(1) # fill write cache
  SetCvar.freeze
  SetCvar.set(2) # hit write cache, but should check frozen status
end

test_set_cvar_on_frozen_object()
```

PR Here: https://github.com/ruby/ruby/pull/7124



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