Commits on May 27, 2018

1. Use frozen string for hash key …

   When use non-frozen string for hash key with `rb_hash_aset()`, it will duplicate and freeze it internally.
   To avoid duplicate and freeze, this patch will give a frozen string in `rb_hash_aset()`.
   
   ## Before
   ```
   Warming up --------------------------------------
                   json    14.000  i/100ms
   Calculating -------------------------------------
                   json    148.844  (± 1.3%) i/s -    756.000  in   5.079969s
   ```
   
   ### After
   ```
   Warming up --------------------------------------
                   json    16.000  i/100ms
   Calculating -------------------------------------
                   json    165.608  (± 1.8%) i/s -    832.000  in   5.025367s
   ```
   
   ### Test code
   ```
   require 'json'
   require 'securerandom'
   require 'benchmark/ips'
   
   obj = []
   
   1000.times do |i|
     obj << {
       "id": i,
       "uuid": SecureRandom.uuid,
       "created_at": Time.now
     }
   end
   
   json = obj.to_json
   
   Benchmark.ips do |x|
     x.report "json" do |iter|
       count = 0
       while count < iter
         JSON.parse(json)
         count += 1
       end
     end
   end
   ```

   

   Watson1978 committed May 27, 2018
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