revert line number spec of *return events.

* compile.c (rb_iseq_compile_node): line number spec of :return, :b_return
  and :end events of 'TracePoint` is changed for [Feature #14104].

  Quoted from [Feature #14104]:
  > Line numbers on :return/:b_return events show the last executed lines,
  > instead of end lines (without return statement).
  Note that :end event also affected.

  However, "buybug", a well-known ruby debugger depends on previous behavior
  so that I reverted this specification.

* test/ruby/test_settracefunc.rb: catch up this fix.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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