Improve Time#+ & Time#- performance

* time.c (wadd): use internal addv() function to calculate internal value in
    Time object. On 64-bit machine, Time object might have Fixnum object
    internally by default and addv() can calculate Fixnum objects directly.

* time.c (wsub): use internal subv() function due the same reason in above.

    Time#+ & Time#- will be faster around 15%.

    [ruby-dev:50036] [Bug #13357] [Fix GH-1547]

### Before
             user     system      total        real
Time#+   0.820000   0.000000   0.820000 (  0.818081)
Time#-   0.810000   0.000000   0.810000 (  0.813835)

### After
             user     system      total        real
Time#+   0.710000   0.000000   0.710000 (  0.710241)
Time#-   0.710000   0.010000   0.720000 (  0.714151)

### Test code
require 'benchmark'

Benchmark.bmbm do |x|

  x.report "Time#+" do
    t = Time.now
    2000000.times do
      t + 1
    end
  end

  x.report "Time#-" do
    t = Time.now
    2000000.times do
      t - 1
    end
  end

end

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58829 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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