[ruby-core:80857] [Ruby trunk Bug#13507] Improve performance of some Complex methods where call Numeric#real? internally

Issue #13507 has been reported by watson1978 (Shizuo Fujita).

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Bug #13507: Improve performance of some Complex methods where call Numeric#real? internally
https://bugs.ruby-lang.org/issues/13507

* Author: watson1978 (Shizuo Fujita)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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Some Complex methods call Numeric#real? at f_real_p() using rb_funcall().
This patch will provide optimization in f_real_p() when Integer/Float is given as internal objects.

### Before
~~~
Calculating -------------------------------------
           Complex#+      5.226M (賊 3.9%) i/s -     26.145M in   5.011147s
           Complex#-      5.274M (賊 4.4%) i/s -     26.321M in   5.001267s
           Complex#*      3.217M (賊 4.7%) i/s -     16.092M in   5.013429s
~~~

### After
~~~
Calculating -------------------------------------
           Complex#+      6.925M (賊 5.4%) i/s -     34.559M in   5.006583s
           Complex#-      7.124M (賊 4.8%) i/s -     35.652M in   5.017364s
           Complex#*      3.880M (賊 4.1%) i/s -     19.363M in   5.000170s
~~~

### Test code
~~~
require 'benchmark/ips'

Benchmark.ips do |x|
  c1 = Complex(2, 3)
  c2 = Complex(2, 3)

  x.report "Complex#+" do |t|
    t.times { c1 + c2 }
  end

  x.report "Complex#-" do |t|
    t.times { c1 - c2 }
  end

  x.report "Complex#*" do |t|
    t.times { c1 * c2 }
  end

end
~~~

### Patch
https://github.com/ruby/ruby/pull/1598



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