[ruby-core:99002] [Ruby master Feature#17004] Provide a way for methods to omit their return value

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Issue #17004 has been reported by shyouhei (Shyouhei Urabe).

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Feature #17004: Provide a way for methods to omit their return value
https://bugs.ruby-lang.org/issues/17004

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Priority: Normal
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In ruby it often is the case for a method's return value is not used by its caller.  Even when a method returns something meaningful, callers are free to ignore them.

Why not provide a way for a method to know if its return value is needed or not.  That adds a room for methods to optimize, by for instance skipping creation of complex return values.

Following pull request implements `RubyVM.return_value_is_used?` method which does that: https://github.com/ruby/ruby/pull/3271



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