[ruby-core:80789] [Ruby trunk Bug#13482] Improve performance of "set instance variable"

Issue #13482 has been reported by watson1978 (Shizuo Fujita).

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Bug #13482: Improve performance of "set instance variable"
https://bugs.ruby-lang.org/issues/13482

* 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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"set instance variable" will be faster around 14%.

## macOS 10.12 + clang-802.0.41
### Before
~~~
       user     system      total        real
   1.550000   0.000000   1.550000 (  1.555161)
~~~

### After
~~~
       user     system      total        real
   1.400000   0.000000   1.400000 (  1.398825)
~~~

## macOS 10.12 + gcc 6.3.0_1
### Before
~~~
       user     system      total        real
   1.660000   0.000000   1.660000 (  1.659721)
~~~

### After
~~~
       user     system      total        real
   1.450000   0.000000   1.450000 (  1.454589)
~~~

## Ubuntu 16.04 + gcc 5.4.0
### Before
~~~
       user     system      total        real
   0.890000   0.000000   0.890000 (  0.891217)
~~~

### After
~~~
       user     system      total        real
   0.790000   0.000000   0.790000 (  0.783157)
~~~

## Test code
~~~
require 'benchmark'

Benchmark.bmbm do |x|
  x.report do
    i = 0
    while (i < 50000000)
      @obj = 42
      i+=1
    end
  end

end
~~~




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