[ruby-core:111912] [Ruby master Feature#19355] Add finer coarsed locking for searching callable method entries

Issue #19355 has been reported by luke-gru (Luke Gruber).

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Feature #19355: Add finer coarsed locking for searching callable method entries
https://bugs.ruby-lang.org/issues/19355

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
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During multi-ractor mode, unfortunately when calling methods often there's a call to the internal cruby function `callable_method_entry`, which
returns a cached CME or a new one. In the case that it's cached, there's a VM lock around its access that could be reduced to a lock
pertaining to the class of the caller of the method. This reduces locking in multi-ractor mode and allows, for example, object allocation to happen
at the same time as method calls.



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