Take a method, unbound method, proc, or thread backtrace location.
This is our equivalent to RubyVM::AbstractSyntaxTree.of, and could
be leveraged in something like error highlight.

Note that this uses CRuby-specific APIs on CRuby, and falls back
to using location-based APIs when those aren't available.

https://github.com/ruby/prism/commit/02a93356a3