time.c: Improve Time#to_i performance

Time#to_i will be faster around 80% (on 64-bit platforms).

* Before
       user     system      total        real
   2.840000   0.000000   2.840000 (  2.847238)

* After
       user     system      total        real
   1.600000   0.000000   1.600000 (  1.598911)

* Test code
require 'benchmark'

Benchmark.bmbm do |x|
  x.report do
    t = Time.now
    20000000.times do
      t.to_i
    end
  end
end

* time.c (_div): new function avoid rb_funcall
  (div): replace with new _div function
  [ruby-core:80636] [Bug #13418]
  Thanks to Watson <watson1978@gmail.com> for the patch.

From: Watson <watson1978@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58308 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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