[ruby-core:112052] [Ruby master Bug#19381] SEGV - ivars, both Ubuntu & Windows

Issue #19381 has been reported by MSP-Greg (Greg L).

----------------------------------------
Bug #19381: SEGV - ivars, both Ubuntu & Windows
https://bugs.ruby-lang.org/issues/19381

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0dev (2023-01-26T07:31:08Z master 6422fef90c) [x86_64-linux]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
I've used code similar to the below for a long time.  When max is set to 50, it runs.  When max is set to 51, it SEGV faults.

Rubies tested:
ruby 3.3.0dev (2023-01-26T07:31:08Z master 6422fef90c) [x86_64-linux]
ruby 3.3.0dev (2023-01-26T07:31:08Z master 6422fef90c) [x64-mingw-ucrt]
ruby 3.3.0dev (2023-01-26T07:31:08Z master 6422fef90c) [x64-mswin64_140]

I suspect it involves the changes in https://github.com/ruby/ruby/pull/7183 'Limit maximum number of IVs on a shape'


```ruby
module Test
  class << self
    def run
      max = 51
      (1..max).each do |v|
        instance_variable_set("@iv#{v}".to_sym, nil)
      end
    end
  end
end
Test.run
puts Test.instance_variables
```




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