[ruby-core:96103] [Ruby master Bug#16399] TracePoint.stat disappeared in Ruby-2.7.0-preview3

Issue #16399 has been reported by TOKI.Yoshinori (仁謙 土岐).

----------------------------------------
Bug #16399: TracePoint.stat disappeared in Ruby-2.7.0-preview3
https://bugs.ruby-lang.org/issues/16399

* Author: TOKI.Yoshinori (仁謙 土岐)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0preview3 (2019-11-23 master b563439274) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
`TracePoint.stat` method that existed in Ruby 2.6 (including 2.7.0-preview2) no longer exists in Ruby 2.7.0-preview3, but instead, `TracePoint#stat` method that did not exist so far has been added.

Test Script:

```ruby
#!/usr/bin/env ruby

require 'test/unit'

class TracePointTest < Test::Unit::TestCase
  test 'TracePoint.stat' do
    assert_respond_to(TracePoint, :stat)
  end

  test 'no TracePoint#stat' do
    assert_not_respond_to(TracePoint.new{}, :stat)
  end
end

```

Output (Ruby 2.7.0-preview3):

```
$ ruby -v
ruby 2.7.0preview3 (2019-11-23 master b563439274) [x86_64-linux]
$ ruby test_tracepoint_stat.rb -v
Loaded suite test_tracepoint_stat
Started
TracePointTest:
  test: TracePoint.stat:                                                                                                        F
======================================================================================================================================================
      4:
      5: class TracePointTest < Test::Unit::TestCase
      6:   test 'TracePoint.stat' do
  =>  7:     assert_respond_to(TracePoint, :stat)
      8:   end
      9:
     10:   test 'no TracePoint#stat' do
test_tracepoint_stat.rb:7:in `block in <class:TracePointTest>'
Failure: test: TracePoint.stat(TracePointTest):
  <TracePoint>.respond_to?(:stat) expected
  (Class: <Class>)
======================================================================================================================================================
: (0.005388)
  test: no TracePoint#stat:                                                                                                     F
======================================================================================================================================================
      8:   end
      9:
     10:   test 'no TracePoint#stat' do
  => 11:     assert_not_respond_to(TracePoint.new{}, :stat)
     12:   end
     13: end
test_tracepoint_stat.rb:11:in `block in <class:TracePointTest>'
Failure: test: no TracePoint#stat(TracePointTest):
  !<#<TracePoint:disabled>>.respond_to?(:stat) expected
  (Class: <TracePoint>)
======================================================================================================================================================
: (0.000824)

Finished in 0.006592796 seconds.
------------------------------------------------------------------------------------------------------------------------------------------------------
2 tests, 2 assertions, 2 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
0% passed
------------------------------------------------------------------------------------------------------------------------------------------------------
303.36 tests/s, 303.36 assertions/s

```

Expected Output (Ruby 2.6.4):

```
$ ruby -v
ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-linux]
$ ruby test_tracepoint_stat.rb -v
Loaded suite test_tracepoint_stat
Started
TracePointTest:
  test: TracePoint.stat:                                                                                                        .: (0.000265)
  test: no TracePoint#stat:                                                                                                     .: (0.000046)

Finished in 0.0006746 seconds.
------------------------------------------------------------------------------------------------------------------------------------------------------
2 tests, 2 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed
------------------------------------------------------------------------------------------------------------------------------------------------------
2964.72 tests/s, 2964.72 assertions/s
```




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